Campaign
Let me start off with a question on this one. ES, wtf? Honestly, I don't know what you guys were thinking when you made the campaign. Don't get me wrong, you guys were good(to some degree) with the canon. I don't know what happened... Either you guys dropped the canon into a few thousand pieces, and tried to piece it back together with glue and scotch tape... And you seem to be forgeting the closer part with certain vehicles and units. Graheme once said as an example "The reason you don't see wolverines is because the factory was on Mars, and that factory was bombed in 2535 blah blah blah...". Either you guys forgot to add the reasons, or I'm not looking hard enough. Maybe the answers are in the black boxes that are scattered throughout the campaign, so I could be wrong there. Anyway, to get on a good note, the campaign is atleast fun. To make a long story longer, this campaign is only for a select few groups. If you like fun, and are not much into story telling, you'll have a blast playing the campaign. If you're one of those people who only played halo 3, never read any of the books, and basically know nothing of the story, like RTS games, you should like this campaign. If you like to watch things crash and burn, then you should also play the campaign. Also, you achievement whores should like the campaign, as most of the achievements are there.
Now, here are the people who should avoid the campaign. People who have an overly obsetion with the halo story line, that a single inconsistancy will send you into a frenzy and killing spree. If you like a good story that makes sense, stay away from this. If you are one of those achievement whores who are also a fan of the halo story, you'll more than likely tear yourself in two unsure if you should do the campaign or not. Although, you could always play co-op and have the other guy do all the work while you do something else.
Let me sum up those two paragraphs with this. If you like the halo story, then avoid this campaign. If you like fun, achievements, and don't care for the halo story, you'll enjoy the campaign.