It's Russian roulette! some have been immaculate, some have been garbage. at sub $1.00 though I'm willing to gamble.
As for quality of games it's limited. There's tons of sports games to skip through but anything Battlefield, COD, Assassians Creed, God of War, Fable, etc. you may have missed is usually up there. So far I'm getting about half of what i ordered in its original case and 2 /3rds of that has its books. Some are disc only (usually noted) but a good bit comes in those generic cases beat to pieces. Usually its just the case thats garbage, every once in a while the game is pretty trashed. Great for filler and achievement hunting