i think halo2 was built 4 multiplayer, not campaign. if you think about it, the new campaign wasn't as good as the old one at all.
[Edited on 8/31/2005]
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I loved the Halo 2 campaign although i find halo 1 campaign better, i also dont see how halo 1 and 2 tie in together storyline wise, i mean where does all the stuff about the arc come from? also according to MLG players, if you play campaign it makes you a n00b, question, how the hell does it make you a noob?