Yeah, I bought it and played like 5 minutes of it, but my brother went through the entire thing last spring and what I saw of him playing looked fun, so I may have to go through it myself and beat it. Of course I've said the same thing about Left 4 Dead and Gears of War although I did get like 25% of the way through those.
I need to finish some of these things so I can get rid of the ones I'll never play again like L4D.