Halo games are awesome.  I do not have an X-Box, or the games, but my cousin does and I love those games.  They're awesome, and so is the gameplay.  I don't know about you people, but I liked the plot and storyline.  I thought it was good.  As for half-life and that other crap, never played those, but they all seem kind of like take-offs.  Halo 1 and 2 are great games, especially since you got to be an alien dude in the second.