Best story from the Halo-verse yet. Most engaging characters so far. Unparalleled level of customization, both for games and characters. Addictive and fun gameplay. Most comprehensive Halo multiplayer ever. "Psych profile" feature actually pairs you with like-minded gamers!
It's like all the pieces that Bungie has been building over the years finally came together. With all the options for changing the game that players are provided, this is a title that you could get YEARS of enjoyment out of.