I also don't remember hating Jool so much. Unlike any other character, I was really glad when she left. Everyone else I loved and it probably made for my favourite ensemble cast of any show.
This was one of the major reasons I don't hold Season 3 in a high regard like others. It was a great season, don't get me wrong, but all the yelling and screaming was a bit annoying, mostly coming from Jool and Chiana. Jool slightly improved though (Especially in the What was Lost two parter) but she might be my least favorite character. I was surprised too how much I didn't mind Noranti though.