IMHO games that don't get boring.

COD4
COD World at War
Skate 1 & 2
Halo 3
Madden 09
Gears 2 (Although don't get discouraged that some 8 year old kid smokes you all game!)... little jerks...

Haven't played it yet but I guess Too Human is pretty sweet?

Gamertag :: V1L3 DiaL3cT < Use It. Let's play!