Halo 2: Graphics and Multiplayer Half Life 2: Better Graphics, better Multiplayer (CS and Deathmatch) The Havok Engine, a great story, better enemys and a huge amount of Mods that will last for years
Half Life 2 is much better 99% of the time. But when your at a friends house up until 3 in the morning Halo2 on Xbox live is more fun. Other than that though HL2 is better in every way
half - life 2 the only time i really play halo2 is when i have like big xbox lan parties. xbl gets boring after like 20 min