Halo 2

Halo 2's features are clearly advertised, duel wielding! X-box live!, destructable vehicles! But once you get the game you pretty much know what it has(not the storyline, the features). What you first play Half Life 2 you are surprised at every turn. Its the enviroment, its the feeling that wow, this level looks like that place I drove past on our trip to LA. OMG i can use the gravity to pick up scanners and use em as buzzsaws, OMG the pulse rifle secondary fire vaporized that guy, OMG i just dropped that car on those zombies, killing them instantly, OMG i can roll nades into gun turret holes, OMG my crossbow bolt pinned the guy to the wall upside down by his leg, or OMG this blue gravity gun can pick up enemies and throw them at other enemies. I know I've played ravenholm about 3-4 times just cause its awesome killing zombies with the Gravity gun. And look how far Half Life has come, people are still making mods for a 6 year old game. Imagine what they can do with the source engine!? Half Life 2 will last much longer than Halo2 and I bet Microsoft is trying to make Halo 3 as fast as possible so people don't lose intrest in the Halo series. Whereas Valve will take it's time because Half Life 2 isn't gonna lose intrest anytime soon.