They are judged on the dance and gynastic element of the performance and the stunting which takes athletism and a lot of practice. The teams who perform at the highest level - most in sync, best stunts, etc. wins. It is no different from being judged for gynastics or dance as individuals or team. Back when I was in school the cheerleaders were the side show. They were there for people to watch as they jumped around in tight sweaters during football games. They did cheers with some hand motions and maybe someone would do a split or cartwheel.