Me and my friends beat it today.
The last world was a bitch and a half to beat- especially on co-op, that shit got hard, and fast.
The fact that DK jumps and drops like a bag of wet fucking cement didn't help things. Though the last boss was disappointingly easy once the pattern was down. The same can be said of all the game's bosses (and I was disappointed that they reused World 1's boss for World 6).
Now I gotta collect all the goodies, and I think that's gunna take a loooooong time.
Great game, though. Lots of fun, and probably underneath DKC2 as far as arbitrary rankings go. Retro once again gets all of my love.