Yeah, I have to go with the crowd on this one. Condemned was the first game I bought for 360, and I enjoyed the hell out of it. I was actually sad after I completed it because I really got into the story. I can't wait for the sequel!
Also, it was the game that popped my HD cherry, so it was crazy seeing shadow and lighting effects that actually made me jump. Plus, as others have mentioned, it's just freakin creepy! There. Is that convincing enough yet? lol...easily worth $15..or $12.72 for you really lucky bastards!