Did I like Halo 4?
No.
Why didn't I like it?
Campaign: Too many leaps of faith were made by 343 industries that just didn't seem to fit with the setting. The Mech, the levitating forerunner weaponry, and the antagonist were all redundant and seemed forced into a setting that, established by many previous games, didn't seem to fit.
Multiplayer: My biggest problem with multiplayer is I was an Elite fan. And as an Elite fan, I am not only completely alienated by the multiplayer experience, but my opinions and options are completely disregarded by anyone 'official'. As if Bungie saying "if you play as an elite, you probably dont belong in matchmaking" wasn't insulting enough, but now 343 is completely and utterly IGNORING the fanbase I belong to.
All in all? It will tide me over for 2 months until Aliens: Colonial Marines, which is going to actually be a good game that stays true to all its fans, is released.