Once they calmed Carlene down, I actually came to like her, but Alison? What a horrible character. I always thought Alison is who Suzanne would have been with a less talented actress and poor writing. Alison was just mean with no redeeming qualities and it wasn't fun watching her have such contempt for the people around her. Yes Suzanne often thought she was better than most but she loved the girls and Anthony, she was human and had a warmth about her, something Alison lacked.
As for Carlene, like I said, once they calmed her down and she stopped being such an idiot, I actually came to like her. BJ seemed redundant since we already had Julia, that was also the season they decided to turn Mary Jo into Julia-lite, so it was like we had three Julias running around, it was too much.