I've been playing games on the pc for the last 14 years. I've played adventure games, (like the Monkey Island, Syberia and the Sherlock Holmes games) action games, and mostly rpgs. And let me tell you, I've seen it all. In 2006, a game called Oblivion came out. And the Elderscrolls fans raged not for weeks, no they raged for years. Un til in 2011, Skyrim came out, and all was forgiven and Oblivion was forgotten, even by the most rabid and fanatical ES fans. Why did fans rage when Oblivion came out? Because it wasn't Morrowind, because you couldn't fly anymore, because you couldn't use the same transportation as in Morrowind, because you could insta travel to anywhere on the map, and because of the quests popups etc. Interestingly, when a little game called the Witcher in 2007 used the same quest popups, no-one seemed to care anymore. I'll admit I had a ton of more fun playing Oblivion than I did Morrowind, simply because it was easier to see where I was going in Oblivion than in Morrowind.
Yes, even in the modest and somewhat more mature (meaning elder than normal gamers) adventure game forums, I've seen people complaining. First it was (I think?) when we went from typing commands like look into a textbook to use the mouse to look around, then it was when we went from 2D slidescreens to 3D environments but with 2D characters or vice versa. And the latest complaint was when Still Life 2 came out and tried to solve the problem that a person in an adventure game could have a ladder, a monkey wrench and a matress in his pocket by adding a sort of inventory system. However, people seem to have accepted this a part of the development of adventure games....
As for the inventory systems, I find it a tragic and also a bit comical (if that's a word?) that ME2 is now regarded as highly as it it. When it was first released, people were outraged, the inventory was gone, the upgrades to the guns etc. were gone and a bunch of other faults and problems they fans had with ME3. (and I'm not counting the tech problems here, just the gameplay problems people had with the game).
Shooter fans were not happy with the combat in ME2, neither were the rpg fans. For ME3, though, I feel that Bioware finally made the correct decision and decided to make the combat as good as the best shooter games out there.
As for ME2, people also complained about not being able to use their old companions from ME1, and that the companions and crew in ME2 were their own persons more so than in ME1 etc. etc. However, I feel that it is exactly this feature that has made ME2 more popular now with the fans as compated to the new game, ME3. Interestingly enough, I don't remember any complaints about the dialogue wheel or that ME1 would have a voiced protagonist.
To continue a bit about complaints over games: In 2006, Obsidian released NWN2. Many people complaint about the ending to this game, little did they know it was to set up the player pc for two amazing expansions. Also, the ending to Fallout 3 received a lot of complaints form ES - and other - fans, mainly because it didn't make sense at all. Bethesda finally corrected this in the Broken Steel DLC.
As for DA2, what I really disliked were the wave combat; the DA2 team released a pacth, I think in may or june 2011, where the waves were toned down a nothc or two, and then two amazing dlcs that did adress at least some of the problems, people had with the combat in DA2. To me, however, the personal story of Hawke and the characters were all amazing, especially their backstories. And the best of it all was that their clothing really fit their background stories. Fenris and Isabella felt like, no, not like real people, but like people that could have appeared in a movie, a tv-series, or in a book. I've guess that is what Jack and Thane feels like to the people who have played ME2.
As for Jade Empire, the game sold, I think, about 1,5 million copies in total. And I clearly remember the fans being angry when Bioware announced the Jade Empire, when Bioware announced it wouldn't have an inventory and that we couldn't use the space bar to pause the game, since it was an action rpg. To mw, however, the combat reminded me more of the old beat-em-up games where you used your fists and legs to thow different combat moves etc. at your enemies.
As for ME3, most players agree that 90% or evem 98% of the game is amazing; the final 5-10 minutes are what people are having a problem with. And when you have 90-95% persons on this forum telling Bioware that they a) don't understand the ending

are confused by the ending c) don't understand what the ghost in the machine are doing there or d) demanding a new ending because they don't understand either of the three endings, a company regardless of whom it is should really take notice. And also this: When people that normally play Call of Duty etc. feel that they have done something wrong or didn't play the game the right or correct way after having experienced the ending(s), something should tell Bioware that something is wrong, terribly wrong here.
Of course, a poll on a forum should not be taken as a valid statistics; when 90% or 95% of all people who voted in such poll, however, voted that the endings didn't make sense for various reasons, it is time, I think, for Bioware to listen to these voices. And to ask the question to the fans: what is wrong with the endings? However, I do think that Bioware are well aware of how the fans, and we, the forumites, feel about the endings. And as such, I do hope that the free ending dlc will clarifify things and explain things.
For me personally, I'd like to see a statement by why it wa necessary to place the ghost in the machine in the game's ending. Maybe it'll be explained the ending free dlc...?