Truely an amazing sequel. Its a great fast-paced game that won't keep you bored.
Now this game has very nice graphics espescially compared to other GC games, hands down. Most of the environment is interactive. A place where this game really shows some grapics is in the trophy gallery, where figures of various Nintendo-exclusive characters and other things are shown.
the sounds are pretty detailed. the throwing of punches, the swinging of swords, and the explosion of motion-sensitive bombs can all be heard. Infact, you can even hear the footsteps of characters when they walk or run on the environment. And when two foes execute their attacks at the same time, they're cancelled out and you will get a big "ching" sound. really cool.
Definitely a great game for the GC, you should try it out if you haven't done so.