If it's with your friends, it's on.
Everything is relatively simple, but still, solid enough for getting you insanely excited in every fight, and if you're playing with anybody else, it's twice the fun.
Also, it's pretty easy to stick to it, and whether you like fighting videogames or not, you're going to love this game.
You can unlock new players, stages and some other functions, but it won't take you much time to get everything, the main focus is the replay value.
So if you're looking for a fighting game, or for a fun multiplayer one, then this is definitely a must-buy, the main reason of this, is that you can't compare it to other fighting videogames, it has a rather unique style that no other game can offer you, at least not from any Nintendo console.
As a side note, remember that this title is available in the Wii Shop Channel, for 1,000 Wii Points (10$).