Best PSP game so far
Controls-wise, it handles very well - each character has roughly between 60 and 150 different moves. The main downside is that the manual only shows a few moves - to learn every move for every character you would need to go into training mode, bring up the list of moves and note down all the important ones - this can take a long time considering the number of characters (although most button combinations are used by all characters, so you could play blindly).
Overall, this is the best beat-em-up game I have played to date.