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 first time I played through it, it was my favorite Halo campaign due to the story, but I was still disappointed by the gameplay. Since then, I've played it a lot more, and I've grown to love it. The levels are a lot more unique than I first thought, there are a lot more exciting encounters than I initially thought, and some parts (like the Broadsword part, and at the end with Arrival playing) are some my favorite moments in gaming now. Just my opinion, but eh.