what i liked- Kenny being Mysterion for parts of the episode, like showing up to comfort Karen at night, beating up that one girl at school, etc, some of Cartman's "Your momma so poor" jokes (only some), "Joe Paterno DOESN'T walk into a police station", the ending where Kenny is died, Stan says "What the (Bleep)", and Cartman is upset because he is once again the poorest in the school, amongst other things.
good episode. if there was anything that would bring my score down, it would be the repetitiveness of the Penn State jokes and Cartman's yo momma jokes. but the rest of the episode was so funny and creative i felt, that these two things did not detract. great season finale, this has been a solid run of episodes. A+