Well somebody mentioned starting a thread on Peter and here it is.
1. He mentally and physically abuses Meg and Lois
2. He is retarted
3. He burned down a black mans' house
4. He was dressed as a Klansman
5. He says Meg sucks but there were times he has stunk at doing things (the chick flick and playing the Xbox are examples)
6. He is a horrible father
7. Hekilled a cat in cold blood
8. Hehas sexually harassed women
9. He tried to have sex withConnie
10. When he got his memory back, he still cheated on Lois
11. He told Meg to kiss him on the lips
12. He has abused Stewie by dunking him underwater and spitted on his picture
13. He has shown no remorse
I will think of more but feel free to jump in.