Let's start at the beginning. When the buggy menu FINALLY lets you join a game (that is, if there are any available), you are dropped into what seems to be a waiting area where you can run around randomly. Then you click the join arena button, where it sends you into the g-ball arena, which is a giant sphere full of random things on the ground and floating rings in the air. That's it. No explanation, no tutorial, nothing. It seems they just expect you to automatically know what to do.
Now, the controls. First, you can't change them in game. Second, the standard setup isn't too bad, but it's unresponsive and hard to figure out. For example, why the hell is the button to throw a ball the right click? To move the camera, you have to hold either mouse button and drag, however it too is unresponsive.
Overall, I think this game really does have potential. The graphics and environments are nice, but everything else needs work. Also, it REALLY needs an instruction guide.