Half-Life 2 is pwnage. Pwns Doom 3, Halo, anything. For another $20USD you can get all the mods too, and the mods are pwnage. Bottom line: see sentence 1.
Well I mean....Halo never appealed to me, and Halo 2, although a bit better in every direction, just never caught onto me. Doom 3 (which isn't anything to do with this) has the best graphics hands down of ANY game to date and the most detail, but the gameplay itself was pretty bad. The hacks for Doom 3 (performance ones etc.) were pretty good, but the original game was lacking too much altogether in the action category.
and BritBoarder - Half Life 3?! WHERE?!
Hasn't even started most likely.