Yeah, as you said, I hate Dewey! His earlier Season performances I don't mind too much, but from Season 5 onwards, ughhh!
Particularly in the episode when he smokes, maybe it's because I'm so anti-smoking, but when he was coughing out of control, it reminded me of time when my Cystic Fibrosis acted up, and to think somebody would want to bring that on temselves sickens me. And when Hal smoke to tempt Dewey, I found it hilarious, but Dewey drinking the coffee just felt like it was out of spite, and Hal's top-range acting made him look poor in that scene.
And in the episode "Dewey's Opera", an episode I like, when he walks in while two of his Busey friends are acting and he says "No, no, no!", that got on my nerves, I hate when people do stuff like that! Maybe it's not so much Dewey, but just the things he does.
Normally, I like Stevie, but in the episode "Stevie VS Reese", I really wanted Reese just to beat him up. When Reese bends down to pick up the papers and says he's going to do it anyway, I laughed like mad! But, normally, I do like Stevie.
Mr. Hurckerbee is one of my favourite charactors, too! I'd probably dislike if he was my actual teacher, but I know teachers on his calibre of evil, and to see him act it so well is brilliant. Shame he wasn't in the last episode.