I am constantly looking for reviews of games, and think there's a real opportunity to have users review games on here. I think a tag based system would work well, with each question being a call for the review of the game, and answers would be that users opinion of the game.
[Update] I see that this has been totally misinterpreted - the examples in the answers are all about polls, which I also hate on SO/etc.
This is more like:
Q: Opinion on Mass Effect 2? A: Love it because of a, b, c (+3) A: Love it because of d (+1) A: Hate it because of a, e (+4)
The fundamental failure with the system of SE is that it would violate the "every question must have an answer", but with a community like this, there is a real benefit to all users to have a structure opinion gathering outlet like this.