>>ALERT<<
Class 1337 "noob sauce" inbound; Troll units cleared to engage.
I honestly think Halo 2's was the best, even if it wasn't utilized as well as it should have been (I mean come on, playing Breaking Benjamin while Elites and Brutes kill each other, and you expect me to just sit back and watch... what the hell).
Halo: CE - Obvious reasons.
Halo 3 - Not enough rock 'n' roll music.
Halo 3: ODST - Haven't played it yet, so I can't say.
Halo Wars - Haven't played that either.
Halo: Reach - ... This is a close one, and one of the few things Reach got right. The music alone tells the story of Reach pretty well - AND it's got that rockin' musical piece during ONI: Sword Base. But ultimately... not so much "Halo" as it is something else.