I enjoyed halo 4 almost as much as halo 3, I figure there's no where better to go for a good answer than here.
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I wasn't a fan of the story (wish I liked it though). Multiplayer needed a lot of work, I get that it was their first game, but they had like four or five good examples to use. In my opinion, 343 is trying too hard to make Halo their own. To me it really feels like "Halo inspired by Halo" or "Let's make a game like Halo, but try to avoid copyright infringement." Again, these are just my opinions, and I gladly recognize that I'm in the minority when it comes to this debate.