I like the game a lot, and it seems like its well balanced, but I think $20 for the full multiplayer potential is a bit steep. You would probably get a large influx of players if it went for $10.
What the game defines as a "Fair" fight is laughable. I've played one or two where it was about even, every other one was a horrid landslide in one direction or the other. Stop pairing newbies against people who have invested a lavish amount of time/money in the game.