A tremendous amount of fun, I would go out and buy it as soon as I got the money. I must commend Nintendo on this game, they did a hell of good jod. If you have four players playing simultaneously, it is really fun. There is also a really cool 1 player mode where you not only fight characters one on one, but with teams. This game is original and relatively easy to play, so I would reccomend it to anyone.
Graphics are nice and the characters are classic.
Only downside is it's kind of limited. You don't have to get all the secret characters to get mew. I got mew a lot when I just had jigglypuff. Also, Jigglypuff has no requirements. I got him by beating the game on Very Easy with five lives.