Andrea. Bad writing with a smidge of bad casting.
Carl. Bad writing at times, but definitely bad casting.
Jesus. I don't think the casting was terrible. They definitely underutilized him on the show.
Magna. Didn't think she was a great character in the comics, but she definitely was better.
Negan. I love him on the show. JDM has played him very well. He's still a top 10 character for me. I just enjoyed the comic version a little better. I think he would've been better if TWD was on HBO.