Final Fantasy X and work your way down too 1. Them are it but not in that order. If you are talking xbox exclusive
Halo
Ninja Gaiden (kinda disapointing to see not many others think this because its a bad ass game)
Rainbow Six 3
RS3: Black Arrow
Fable
Street Racing Syndicate (i dont know why, i just cant get enuf of this game)
Them are actually the only ones I can stand to play for a few or more hours. BTW, I cant stand GTA series cuz it gets too old too fast. And starwars games just arent pretty for me to look at even though I love the movies.