The presentation in it's entirety in fact is actually about how bioware intents to enpower the player by having the them interfacing with the narrative on a large scale.
I quoted the phrase "objective story" directly from the presentation, which as explained in the video explains the difference in design approach between Mass Effect and traditional rpg's. The point i'm making here though, as mentioned in the video is that Shepard differs from a traditional rpg protagonist in being not a direct representation of the player but rather an allready established character whose actions can be influnced to a large degree by the player.
And that established character is also augmented by input from the players over how Shepard thinks, feels, and reacts. His psychology and mentality, his personality, up to ME3 when that was wrestled away from the player, is very much in the players control, and that was BW's intent. No, you're not really living as vicariously as with other protagonists, but this established character's thoughts and opinions are largely up the player. And when that was taken away, it was jarring and very weak writing.
For example, my Shepard is an Unfettered, True-neutral/amoral, byronic, semi-sociopathic nominal hero who's above good and evil. He's very much an end justifies the needs type person, who believes that he does what he has to do, with his own motivations to boot. To some extent, he is he who fights monsters. And come ME3, I'm no longer able to play him entirely like this.
There are several quotes that fit my Shepard and his philosophy:
From CoD: WaW; 'Chernov: April 30th, 1945: When he first spoke of Dimitri, Reznov told tales of a hero, someone we should all aspire to be like. At times, I have seen him show mercy to foe and friend alike, and at others, complete brutality... to foe and friend alike. I do not understand him. Perhaps heroes need not question their actions.'
'Necessity knows no law.' - Arnold Schoenberg
'I've seen horrors... horrors that you've seen. But you have no right to call me a murderer. You have a right to kill me. You have a right to do that... but you have no right to judge me. It's impossible for words to describe what is necessary to those who do not know what horror means. Horror... Horror has a face... and you must make a friend of horror. Horror and moral terror are your friends. If they are not, then they are enemies to be feared. They are truly enemies! I remember when I was with Special Forces... seems a thousand centuries ago. We went into a camp to inoculate some children. We left the camp after we had inoculated the children for polio, and this old man came running after us and he was crying. He couldn't see. We went back there, and they had come and hacked off every inoculated arm. There they were in a pile. A pile of little arms. And I remember... I... I... I cried, I wept like some grandmother. I wanted to tear my teeth out; I didn't know what I wanted to do! And I want to remember it. I never want to forget it... I never want to forget. And then I realized... like I was shot... like I was shot with a diamond... a diamond bullet right through my forehead. And I thought, my God... the genius of that! The genius! The will to do that! Perfect, genuine, complete, crystalline, pure. And then I realized they were stronger than we, because they could stand that these were not monsters, these were men... trained cadres. These men who fought with their hearts, who had families, who had children, who were filled with love... but they had the strength... the strength... to do that. If I had ten divisions of those men, our troubles here would be over very quickly. You have to have men who are moral... and at the same time who are able to utilize their primordial instincts to kill without feeling... without passion... without judgment... without judgment! Because it's judgment that defeats us.' - Colonel Kurtz, Apocalypse Now.
'Ser Jaime, I have seen terrible things in my time, Wars, battles, murders most foul... I was a boy in Oldtown when the grey plague took half the city and three-quarters of the Citadel. Lord Hightower burned every ship in port, closed the gates, and commanded his guards to slay all those who tried to flee, be they men, women, or babes in arms. They killed him when the plague had run its course. On the very day he reopened the port, they dragged him from his horse and slit his throat, and his young son’s as well. To this day the ignorant in Oldtown will spit at the sound of his name, but Quenton Hightower did what was needed. Your father was that sort of man as well. A man who did what was needed.' - Maester Pycelle, A Song of Ice and Fire
'There are no true knights, no more than there are gods. If you can’t protect yourself, die and get out of the way of those who can. Sharp steel and strong arms rule this world, don’t ever believe any different.' - Sandor Clegane, A Song of Ice and Fire
'The only limit to my freedom is the inevitable closure of the universe, as inevitable as your own last breath. And yet, there remains time to create, to create, and escape. And escape will make me God.'
— Durandal, Marathon
'Only the insane have strength enough to prosper, only those that prosper truly judge who is sane.'
— Imperial proverb, Warhammer 40,000
'I didn't betray my dream. That's all.'
— Griffith, Berserk
In the moment when I truly understand my enemy, understand him well enough to defeat him, then in that very moment I also love him. I think it's impossible to really understand somebody, what they want, what they believe, and not love them the way they love themselves. And then, in that very moment when I love them... I destroy them. I make it impossible for them to ever hurt me again. I grind them and grind them until they don't exist.
— Ender Wiggin, Ender’s Game
Ender Wiggin is no killer. He just wins. Thoroughly.
— Ender’s Game
Let me ask you something: if the rule you followed brought you to this, of what use was the rule?
— Anton Chigurh, No Country for Old Men
A threat this big, rules go out the window.
— Commander Shepard (Renegade), Mass Effect 2
Do not care what others think. Do you what you must.
— Javik, Mass Effect 3
You think I've crossed a line. There is no line. For the safety of this planet, there is no one I will not sacrifice, no monster I will not call friend, no enemy I will not sleep with.
— Special Agent Abigail Brand, X-Men
Littlefinger: So many men, they risk so little, they spend their lives avoiding danger and they die. I'd risk everything to get what I want.
Sansa: And what do you want?
Littlefinger: Everything.
—Game of Thrones
Faultline: All of the war crimes, kidnapping people, human experimentation, creating monsters, creating psychopathic monsters, letting millions die… and you think it’s for nothing?
Doctor Mother: It's very likely.
Weld: Then why?
Doctor Mother: Because we decided in the very beginning that we don’t want to be left wondering if we could have done more, in the moments before humanity ceases to exist. Why did we make you into what you are, Weld? Because it was an option, a step forward. Why did we keep it secret? It improved our chances. Why did we not tell you about Scion? Because it improved our chances.
Weaver: You made sacrifices, you made sacrifices on the behalf of others, and you made the hard calls, but it was all for something greater. I bet you think you won’t have any regrets at the end.
Doctor Mother: It’s been some time since I lost sleep because of a heavy conscience.
—Worm, Extinction 27.2
Dispassionate, a rather mundane word to describe one of history's most controversial figures. Some revere him as a savior, some revile him as a monster, but if you ever met Paul Redeker, ever discussed his views of the world and the problems, or more importantly, the solutions to the problems that plague the world, probably the one word that would always cling to your impression of the man is dispassionate.
Paul always believed, well, perhaps not always, but at least in his adult life, that humanity's one fundamental flaw was emotion. He used to say that the heart should only exist to pump blood to the brain, that anything else was a waste of time and energy. His papers from university, all dealing with alternate "solutions" to historical, societal quandaries, were what first brought him to the attention of the apartheid government. Many psychobiographers have tried to label him as a racist, but, in his own words, "racism is a regrettable by-product of irrational emotion." Others have argued that, in order for a racist to hate one group, he must at least love another. Redeker believed both love and hate to be irrelevant. To him, they were "impediments of the human condition," and, in his words again, "imagine what could be accomplished if the human race would only shed its humanity." Evil? Most would call it that, while others, particularly that small cadre in the center of Pretoria's power, believed it to be "an invaluable source of liberated intellect."
— Xolelwa Azania, World War Z