I found this in a comments section on Amazon. It's short, and to the point, and sums up what a lot of us feel, I think.
"You say this is Bioware's story to finish how they want. Ordinarily, I'd agree with you. But consider this.
It is an interactive story (or was until the end). You, as the player, shaped the story by your choices as much as the original writers. They invited you to take the story and make it your own. In that sense, it is as far from say, a movie or a book, as you can get. Those are passive experiences, yet if a movie gets a bad test screening because of some part of it, it is often altered.
Bioware, storytellers or not, had one responsibility with this game series. To give us the tools to write the story how we wanted it. And, sadly, at the end, they took those tools away with the equivalent of "And they all lived unhappily ever after, maybe, some of them anyway. We'll leave it up to you to guess."
The weird thing is, as much as I, like you, feel betrayed by Bioware, I feel that I, personally, have let Shepard and his crew down. I feel like it is almost my fault that the game didn't (nay, couldn't!) end the way I would have liked. For making me feel that way, if for nothing else, Bioware have lost my respect completely.
I hope they are happy with their "Artistic Integrity". "