The last Halo book I read was Ghosts of Onyx and Halo 4 didn't confuse me a single bit. Whatever questions I have, I know will be answered. That's the point of a damn story arc across 2 future games and who knows how many seasons of Spartan Ops.
I honestly cringe when people say those words simply because I know it's some adolescent random that one, shouldn't even own the game to play, and two, keep screaming for instant gratification and have zero patience. Game companies listen to these people sometimes and it's NEVER good.