I know it is still in beta, but so far I have one big problem with the game: The matchmaking.
I want to fight. So when a match is finished, I want to immidiately fight again, and again, and again. It is extremely annoying going into practice mode, being tossed into a match and waiting for the match to start, then wait again for training mode to start, etc ad nauseam. I really hope it will be possible to make rooms and invite players for infinite matches.
If this is already the case, then feel free to flame my ignorance.