Absolutely insane.
Normally I'd state my complaints here but wow I can't even focus enough to think of complaints.
This game is so cool. The music is some of the best in any fighting game, hell, maybe just any fighting game in general. The graphics don't blow me away but they're competent. As mentioned before, the combos steal the show here. The system is so involved that you can look up COMBO THEORY. Yes, combo theory. There are literally outlines of combos you can follow. There are normal attacks and special moves, and there are also super moves that drain a meter. However, that's all pretty standard. What sets this game apart are autodoubles. Basically, once you do a move, if the next hit is one level lower, then you get two hits in for one button press. People set up structures like Starter-AD-Linker-AD-Ender. But that's just basic. The structures get much more involved and you start to realize how insane this game is. Button mashing will get you pretty far against careful players, but true experienced players are just unbelievably dominating. Also, getting a great combo is really satisfying because you feel each hit unlike games such as Street Fighter II where you get repelled backwards when you make a hit.
In conclusion, this game is definitely worth playing just to experience how crazy it is. I definitely recommend this one.