Good when you're bored, or when you want to beat your friends up.
Playing is lots of fun at the beginning but less patient players will get bored after a few days, cause playing against the AI is very repetitive. The story is practically nonexistent, except for little messages in the message box, but you stop paying attention to them after you play the same stage for the 20th time to gain exp. PvP is waaay more fun but even if you beat everyone (there's a max of 8 players per one battle) you get only a small percent of what you'd get if you completed a stage battle (vs AI). Of course you gain botstract from beaten players, which is unobtainable otherwise, but it's function hasn't been implemented in the game yet.
That reminds me that this game is still very incomplete.
The sounds are just terribe with exception of hitting sound. This one's pretty nice, but I still prefer playing with sound turned off.
There are lots of bugs, cheaters and scammers in this game too, but it's FREE!! Of course except the COOLEST LOOKING parts which can be bought with acclaim coins (bought with real money) for a certain period of time, ranging from 1 day to 1 year for some of them.