This looks like a ton of fun but just can't play on PC.
Why not? If it's a control issue just use a console controller. I use a PS3 controller with xinput wrapper (so it's recognized as a 360 controller) plugged in through USB.
I like 4 player free for all the most so far. It's fun to be one of the two left standing each round. People do really dumb stuff they wouldn't normally do in 1v1 too, love tricking people into getting hit on my first swing.
The game definitely has some online issues though, especially when searching for free for all. Errors/timeouts (usually before getting into a match), and desyncs abound (during a rematch sometimes). Only search for 1v1 for a more stable experience.
Online, getting false positives from the audio is annoying. Like when my opponents character makes a death noise (because lag compensation thinks they got hit) but they returned the ball. At least a quarter of my deaths are from that. Maybe if there was an option to turn off death audio, though it would be less satisfying. Or maybe delay it so the noise would only play when they're for sure dead.
I have a similar issue with special bar/special move noise. With Candyman for instance, after 4 hits his bar is filled and he says "haha look out" or whatever and continues to say it for each subsequent hit to let you know his bar is full. But he also says the same thing when using the special, so the audio is tricking me into thinking he has/hasn't used it. I think filling the bar and using the move should have different noises. edit: I played more last night. In the same scenario of Candyman hitting the ball a lot the noise was not made. I distinctly remember it happening before when the special wasn't used, maybe a glitch? Anyway, what I said here doesn't seem to be correct.
So pretty much, if I were to turn off voices/sound effects I would probably play better. I love all of the personality Reptile put into the audio, I'd rather not turn it off.
The game is super fun despite these thing! Buy it so I have more opponents online.