Really, it's only fun when you have a group of friends.
As fun as it was at first, the one player... sucks. It is so boring after like 5 tries. It is the same characters over again and you get sick of doing the whole classic over again.
The multiplayer however, is a blast and never dies. Really the ssb series is proabably nintendo's best multiplayer.
The graphics could have been way better. They got way to lazy when designing the items and stuff but they made it all better in melee so thats a good thing.
The music wasn't that good, only a few levels had good music, otherwise it was satisfactory and didn't really get you into the level atmosphere it might have had.
If you have some friends who love this game, then buy it and play it when they come over, if not at all, then just stay away from it, get a gc and buy melee.