That may be the case, but I fundamentally disagree with it. Also, how much money do you feel ZUFFA is entitled to?
Their choice to sue is odd as well since no one is buying the game, most people don't even know it exists.
But in the end I disagree with their right to sue over saying "ultimate fighting weapon" in the description on the back of the box. "ultimate fighting weapon" isn't a sport, UFC ultimate fighter or any of that. I think it's a waste of time, money and it's petty.