I am a fan of ME. Was waiting on the very first ME before it was released. And I played and enjoyed ME3.
If only your regular criers got in and started complaining about the ending to an epic trilogy (and there always will be people like that) it would never get beyond a few topics and BW would never address it. Fact is it pissed so many different people off and for so many reasons that even BW was forced to address it. Why? You have no idea why because you haven't played the game. Defending your ideals like the decision is between light and dark is childish, there are many shades of gray in between. ME3 is a great game and ending sucked on many more levels than your usual game. This has next to nothing to do with people crying about a bad ending because they hate it, it is just a terrible end to the trilogy, it does not follow from anything and feels pulled right out of the ass of a game developer who just wanted to be done with the game, plain as that.
You've made an opinion on the situation without knowing anything about it. And who even said they have to change existing ending? They can add a continuation expansion to provide a better end (eg Fallout 3). Play the game then people will listen to you.