Most fun co-op this gen. It can lag a bit online if you play with people overseas. Best is to play locally anyway. You can grab onto eachother, slap eachother of ledges, set of traps. Some of the multiplayer challenges are pretty difficult but tons of fun to try. Never had as much fun playing with 4 people at the same time.
Some of the story levels are true works of art.
I spend a few months on making a level, don't try it until you're used to the controls. It's called temple of the prism, it has some zelda style puzzles in the 2nd half. Check my list of hearted levels if you want to avoid the crap. I haven't played it in a long time, but I easily found over a hundred great levels with lots of variety. (Be warned a few in there make dkcr seem like a walk in the park)
Best way to find levels (outside from looking on the internet) is find one you like and check which levels the author has hearted.
