Well, although I don't like ME3, I support the idea of re-creating the ending in order to deliver something more appropriate; something the fans were expecting from day one.
You see, we've all played games a-plenty that have shitty endings. I'm thinking of last gen. games, for some reason. And what did we do when a game's ending sucked? We just sat there, crying a little and hoping we won't be sore in the morning because of all the rape we've just been through. Then we would proceed to try and get rid of the game as soon as possible, like a girl trying to get rid of her dirty bed sheets after a passionate night with her boyfriend in her parent's house.
So my first thought when I heard all this was: "Oh, we can do that?", referring to requesting an alternate ending. I suppose as the audience, we are somewhat entitled to ask for a better ending than what we got. I've seen the ending and I gotta say it IS pretty shit. And like Jim said, if BioWare is caving, it means they kinda agree with everyone's opinion.
However! Being BioWare and EA, you know they're gonna re-release the ending...in the shape of DLC. And that pisses me off. "Oh, you want MORE of this? Alright, you got it...but pay up first! Trololo!11!!".
Look, videogames ARE art and in theory, they shouldn't try and change a piece of art, just like you wouldn't ask the Mona Lisa to be re-painted but with different clothing in order to suit our modern needs. This is why people didn't make such a fuss about Harry Potter's ending. But in that case, the ending was very fitting. They got their pseudo-happy ending--nay, their appropriate ending, and everything was fine.
So you see what I'm getting at? BioWare should know more than well what fans were expecting and the direction they wanted to take. However, they chose to ignore the fanbase and go with what they wanted. As an aspiring artist, I know how to cater my audience. I'm not gonna present a very well done illustration to people who love abstract paintings and vice versa. If I'm doing it for the heck of doing it and to please myself, then sure, whatever. But not when I know my works of art will be aimed and looked at by tons of people with a specific taste.
Videogames ARE art, but publishers still need to acknowledged that and learn how to handle that medium.