So I buy Tomb Raider.
When you finish the demo and buy the game, you don't get any achievements. Kind of annoying. I go back to the first level to replay it and re-do the 'get all the red skulls' cheev. All the red skulls are gone - the game remembers that you got them, and I think you keep the reward for it, but it does not award the achievement. So I have to do it on a second level, or use a save file on a separate memory device. OK..
Also, every time you cross between areas (and I don't mean walk off a screen) the game stutters and gags and the music comes to a halt. It's really annoying and it happens A LOT. The demo was silky smooth. I was playing with two different Gamertags logged in, I don't know if maybe it was leaderboard postings or something that caused the interruption. But it really, really sucks.