Orchomene seems to be one who prefers anti-heroes and morally ambiguous misanthropy to enduring themes of heroism that have existed since the earliest dawn of literature. At least that's as much as I can glean from his comments that describe the notion of a "hero saving the world" as "immature," not to mention his praise of Nietzschean principles and self-interested ideals.
There is something enduring about heroic idealism that has made those themes timeless in our literature. From Beowulf to the Odyssey right on through the ages to Ivanhoe and further into modern times to Luke Skywalker. Not that there aren't as many scoundrels in literature as well, but my point is simply saying that to call stories in games for featuring themes of heroism as "not mature" is plain facetiousness.
He is free to dislike the game because it wasn't his kind of game. I will not, though, hear outright denials of things that are in the game.
The problem is, you probably have. As BW has decided that ME3 will also be a standalone game, I don't see any feasible way that they can make the decision at the end of ME1 have any huge impact.
I can. They will
have to, being all the build up and foreshadowing that was experienced in ME2. By standalone game, I assume they meant that the game's story will follow the "canon" Shepard story just the same as it does in ME2, that it will be something that a new player can jump into and know exactly what he or she is doing. Nothing more, nothing less.
How can you have an event that new players know nothing about play a pivotal role in the game? If someone who's never played an ME game before keeps hearing in ME3 about "when the Council died, this happened..." or "If the Council hadn't died, we could have...", they're going to be completely out of the loop, and since ME3 is designed to be it's own game with a story that anyone can follow, I can't see how a decision in a game BW assumes you've never played can have major ramifications.
From a writer's perspective, it's easy. Less simple in game design. At the beginning of ME2, Shepard gets a quick refresher on major events that occurred in ME1 right after Cerberus recovers him. In ME3, it would be simple to have a cinematic or news story run recapping the most major events in the story so far. There would be the canon, and then the variations of the story therein. Don't expect the Renegade path to differ much from the canon tale that Bioware has set out, though. Perhaps they have a more clever way of implementing it, we shall see.
I'm not sure I understand how choosing "whom to recruit and when" constitutes major choice? If my breakfast is toast, eggs, and bacon, does it matter what order I eat them in? If you recruit your team in order A,B,C,D, and E, and I go E,D,A,B, and C is our game experience / storyline any different?
It doesn't affect the main storyline much, outside of characters that have dialogue at certain junctures during missions, but like the breakfast example you named, the difference is in the nuances. The flavors from eating the egg, bacon, then toast is a different experience from eating the toast, bacon, then egg.
In addition, the "grave consequences" of not following through on their concerns is that that team member dies, but really, so what? You can still accomplish the mission if the majority of your team dies, right?
If you don't have any attachments (or loathings, for that matter) to your team members by that point in the game, I don't think this is the game or story for you then. On top of the emotional loss, you can still accomplish the mission, but the cost for carelessness is likely allies in the next and last installment.