Hoo BOY if you were feeling lost story-wise in Halo 3, you are in for a... whatever the opposite of a treat is in Halo 4. An untreat?
It's a fun and gorgeous game that plays well and has a lot of really cool moments. That you would appreciate if you read the approximately seventeen bajillion tie-ins that 343i decided to come out with that contain super important plot details that aren't in the game, at all.