is there campaign co-op and if so is it good or
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No campaign co-op. There is multiplayer coop which takes levels from the single player and tweaks them around a bit to create new challenge. The online community is dead, dead, dead so unless you organize to play with a friend you'll be playing the co-op levels solo 99 times out of 100.
I guess the best way to describe Rez is if a DJ game and Star Fox had a baby, and that baby was on acid...