Well, Halo1 was nice, (I finished the single player campaign), even if the levels were ridiculously repetitive and confusing (I have an excellent sense of direction, but those alien ship and Library levels were completely convoluted).
Never played Halo2 because the PC port sucks (not a fault of the game), and many people were let down by the (lack of an) ending.
But Halo 3 is supposed to fix all that, so...
I know that 90% of the series' allure lies on the MP, anyway, so more power to you guys, I hope it's as good as you people expect!
The packaging sure looks extremely awesome.
I'll be playing TF2 for a while, anyhow, because it's so damn good.