The only playable level is Delta Halo but even that one sucks compared to Halo: CE and Halo 3's levels.
Halo 2's levels are mostly dark and full of flood. And you have to play as the enemy 50% of the time which makes it even worse.
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Meh. Not a huge fan of either campaign. I didn't really finish either campaign till this year despite having Halo since 2005. I really don't find anything compelling about Halo 2. Grave mind looks retarded in Halo 2 and sounds dumb. IMO