Patrick Weekes - writer of Tali, Mordin, Blasto and a bunch of other characters and missions - has allegedly spoken out against the ending.
I say "allegedly", because the original post has been deleted and BioWare claims that Weekes didn't write it. But then they would say that. And if they asked him about it, he'd have no reason to tell them he wrote it.
Well, make of it what you will. It makes more sense than the indoctrination theory, anyway.
Or if you prefer something that has been confirmed true but isn't related to the ending at all, here's a list of everything Patrick Weekes wrote in the game.
Maybe I'm the only one who finds things like that interesting, though.