On Bioware's artistic integrity: Why can I criticize poorly implemented game mechanics, but poor writing can be excused based on "artistic freedom". It's Bioware's game and so they can write it how they want, but they can also implement mechanics just as they want. Won't stop me from criticizing the tedium of planet scanning, why should it stop me from criticizing any writing decisions I find dubious? Beyond that, the writing in Mass Effect cannot be separated from the gameplay of Mass Effect. This isn't a non-interactive story that only unfolds as I reach certain triggers. It's gameplay just as much as shooting people.
I don't think anyone was surprised that at least some number of fans were critical of the game's ending. I'd imagine that if you're a game designer putting out the sequel to a really popular game - you're always expecting that there's going to be at least some degree of negative feedback coming your way. You can't please everyone and all that.
I don't think this controversy is so much about a fan's right to be critical, so much as to what degree the fanbase's sense of ownership is valid, and where you draw the line on what they can conceivably demand in a game like this.
I'm not the first one to bring up comparisons between this situation with the more militant upset fans, and Stephen King's
Misery. That story is all about a writer's greatest fears - a fan going too far in their ownership of the property, and (literally) forcing the writer to make changes to the integrity of their art.
And I think there's a point to be made for that, quite honestly. If the good folks at Bioware really had this exact ending in mind when they started the series, that would be one thing. But, like many games it seems, I think more focus tends to get put in the set-pieces that make up the bulk of the game; and quite often the ending is almost an afterthought. (ME3 would hardly be the first video game ever that had an otherwise pretty good story, that fell flat in the execution of it's ending. Especially considering overall I've been really pleased with how they had wrapped up ME1 and ME2 so well.)
Maybe a bad example, but I view it as the difference between a movie like The Usual Suspects or The Sixth Sense and a TV show like Lost or Battlestar Galactica. In the former - the writers were working from the beginning towards a specific plot twist. Everything up to that point is organically leaving a bread-crumb trail, that when you reach the end of the movie and look back, everything fits together nicely. Because they had planned all along.
With the latter, the writers didn't know themselves what the "truth" behind the mysteries they'd set up were, when they began the writing process. They weren't working on building up to a specific goal the entire time; and instead they were basically "making it all up" as they went along.
Now, I don't really have a problem with that. There's no lack of artistic license lost regardless of which philosophy you choose to follow as a writer (though Edgar Allen Poe might have some things to say about not starting out with a firm ending in mind...) Generally, a show like BSG or Lost is focusing more on the character development anyway - so long as there's closure with the characters at the end of it's run, it's not that big of a deal if people weren't all that pleased with how things wrapped up. (I didn't love the ending of BSG, for example - but it was at least emotionally fulfilling for me.)
Anyway, that's where I fall in regards to Bioware changing the ending of Mass Effect 3. I don't want to be Kathy Bates in Misery. If the end of ME3 was a specific goal that they were always building up to from the outset of the series - then I believe in the artistic integrity of their choices (even if I don't like them) and probably wouldn't download an optional DLC that makes changes to the story. (I don't like alternate endings on DVD extras for this same reason.)
But if, like I suspect, the ending was simply the last thing they worked on, and then had to track back to make it fit - then I don't have much of a problem with Bioware putting out a ret-con. As far as I see it - if they'd put this game to a focus group and received this kind of feedback, I have a feeling they would have made some changes.
For comparison - if a focus group had reacted really badly to the plot twist in The Sixth Sense, they wouldn't have suddenly decided that Bruce Willis was alive the entire time. Because that's the point of that movie - without the plot twist, you don't have a movie, as everything's leading up to that reveal. However, if you weren't always building up to a specific plot twist, and the end wasn't really the main focus of your artistic drive; then I don't really see much of a problem.
Of course, I don't really think any sort of changes are going to make anyone feel much better (and I don't see how it won't just feel shallow and hollow.) But I'd at least be curious to see what they do with it.