It isn't Halo. That's just the problem here. It's fun, but it isn't Halo.
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It was Halo. I really enjoy the campaign, much better then ODST and Reach, but 3 is my fav. The only thing missing was the ring world which has been missing since H3 is why all campaign's since feel lacking somewhat. But I love it and think 343 are doing good things for Halo!