Every mission was very anti-climactic if you know what I mean. They were pretty boring too, and very short (finished it in 4 hours, about the same time as Halo: ODST). The story line was decent, but it was just too messy. The multiplayer aspect of the guy is pretty decent I guess and I hear they're adding a ranking system soon, so should be good.
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The campaign was kinda short. You only get to know the Didact for 5 seconds before actually killing him. They shouldn't make the chief talk too much in this game. [Edited on 11.13.2012 5:05 AM PST]