Up to level 9 in campaign. Can't believe they didn't listen to feedback and made the story even more reliant on Halo fiction. Who made this call? They also completely shit on Halo 4's plot by bringing back Cortana in a completely convenient and trite way.
Also, the confrontation between Locke and Chief mid-game is so poorly edited/directed that it pretty much kills the entire scene. I don't care how intricate your choreography is, if you don't know how to edit it, it looks and feels like garbage.
All the cinematics feel compromised and the terrible, terrible, terrible, technique of fading to black just reeks of a director who doesn't know what to do with what he's been handed.
The campaign's plot is the hands down the worst in the franchise.
343 has fixed the mechanics of the game and it plays great. They're turning the fiction of the world into white noise that no one is going to care about, though.
A disappointment so far. =(