sales are shaky because the partner AI in single player is a joke, and there are massive holes in the co-op gameplay mechanics. Gears of War was a better co-op game a year and a half ago. Rainbow Six Vegas 2 isn't a show stopper either, but based on it's pedigree people rushed out and bought it regardless of the reviews, and none of the major game industry media thought that it was much of an improvement on it's predecessor. Mediocrity sells, and therefore mediocre games continue to be produced. That's why I refuse to pay full retail price for any game that doesn't score at least a 4/5, on a 5 point review scale, or an 8.5/10 on a 10 point scale. Read the reviews before you buy. Average the scores, and make your call. My advice is to buy, but buy used, or wait until it's less than 40 bucks. Otherwise these companies are going to continue to rip you off with half baked productions. Army of Two isn't a bad game, but it in no way shape or form lived up to the hype. Vegas is guilty of that too. I'll save my money for GTA IV, since that's about the only safe bet in the near future.