I played through the Campaign just to unlock the armor I wanted for multiplayer. The gameplay/design is even worse than Halo 2 and the the disgusting dialogue reaches a new low. I can't believe that people lined up to 'find out what happens'.
SPOILER ALERT!!!!
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...................nothing!
I still don't understand why some people don't like Working Designs crazy dialogue in some fantasy cartoon games, but in a more reality based series like Halo its supposed to be "cinematic".
At least the multiplayer kicks ass again, although I still prefer Halo 2's. Its basically a big GI JOE set, with tons of accessories to setup however you want.