I lost interest in world 7, haven't gotten back to it since. NSMB wii had a more fun single player experience. Both suck in co-op. In NSMB wii you're in eachothers way, and in DKCR half the game only works with diddy on donkeys back unless you're masters in synchronized jumping. (still not as bad as super mario galaxy 2 joke co-op)
Why is nintendo so stuck on lives and so adverse to more check points? The game doesn't have to be easier, but having to start all the way from the beginning over and over and over again just isn't fun. Neither is farming for lives to play co-op without getting thrown out of the level every 2 deaths.
The game sure looks pretty though.