I love love love comedy mangas but it has to be very specific--comedy done in a very real and/or ridiculous way. Sounds crazy, but that's why I like shounen-ai type mangas because they don't degrade the story all the way to smut without substance OR (in shoujo) just become so stupid and ridiculous and cliched that the characters mean nothing to me because they have no substance.
Basically, I like substance and believability. Make the characters' relationship believable to me. Awkwardness and funny moments are real. That effortless "rico suave" stuff puts me off more than Dick Cheney in a sun dress.
So if you agree with what I'm saying you'll like this list :)
P.S. just bc I don't like smut by itself doesn't mean I don't like smut IN A GOOD STORY. In that case, smut makes the story even better lolzzz :D