Pick it up a month or two after it comes out, for cheaper, and after seeing reviews, demos and video for it.
There is something to playing a game when it's new and fresh and exciting and everyones talking about it. That shouldn't be completely ruled out.
Enjoy Thief then, I guess.
I didn't buy thief.
Because I knew it had the potential to not be great.
Because I was informed.
I'm just saying, I don't think you need to wait two months after a release and read every review just to be sure you won't waste your money on a game you don't like. If the game is great your going to lose out on some of the release hype and discussion that comes with a brand new game. I don't think that's something that should be ruled out as important.