By virtue of being shoujo instead of being made for men, KnT is going to be tonally different. The fact that the girl is the main character (most of the show is her internal monologue), apparently makes it insufferable to people.
Trying to think of anime is a bit tough for me at the moment for some reason. Maybe ParaKiss or Honey and Clover?
I can think of a lot of shoujo, but if you don't like KnT, I'm not sure if you'd like those. (Hana Yori Dango for one. I've heard good things about Lovely Complex.)
I think the face that the main character is a girl does turn me off a bit. Hana yori dango I watched the drama so I rather skip that one since I already know the story, there won't really be that many differences to warrant a viewing.