The thing I hate the most is people who can only play with one character on the team. For example some DK users, their whole tactic is based on passing to DK with a white ball.
I myself have Diddy Kong, Dry Bones & Koopa and Boo. I know like 10 different ways to score with each of my characters! Pff..
PS. Don't bother mentioning disconnecting and goalie camping.