If you're an adult there is no appeal. if you're a kid you can play it with literally any other kid you meet no matter their wealth, language, console limitations, poor quality internet, anything. It's completely cross platform, free, and a really terrible game, perfect for children. But if you're an immature teenager seeking glory, you can play this illogical cartoon and win your king of the hill elimination match to prove your superiority above everyone else in your virtual playground. No congratulations if you win because if you don't you might have lost to a 6-year-old.
So it's basically an average game with the biggest draw that it is just super accessible?