Casey Hudson, director of the game that is recently kicking all of us gamers in the emotional gonads, recently said in an interview on Digital Trends on the endings:
I didn’t want the game to be forgettable, and even right down to the sort of polarizing reaction that the ends have had with people–debating what the endings mean and what’s going to happen next, and what situation are the characters left in. That to me is part of what’s exciting about this story. There has always been a little bit of mystery there and a little bit of interpretation, and it’s a story that people can talk about after the fact.
I get that he’s all for making an unforgettable ending, but I think maybe further down the road – when everything has been said and done by all the gamers still getting through this stellar game, Bioware needs to come clean with the decisions they made in devising this ending. It may ruin a bit of the magic, but I always find the analytical breakdown just as stimulating as the mystery.