Most television for children and adolescents doesn’t promote anyone being smart, particularly girls. I think hansioux’s right where most shows revolve around being popular. I should also note my opinion is based on what my little cousins see, and what I read about television… the whole no cable thing, and all.
I also enjoyed Clarissa, though I didn’t get to watch it when it was new.* I’ll still put on Sabrina when I’m at my parent’s (yes to cable there) if there’s nothing else that catches my eye, for the most part it doesn’t make me angry, so that’s a plus.
*My television consumption in childhood was seriously restricted. A lot of the “popular” shows from when I was very small I have absolutely no idea what they’re about or have ever even seen an episode. I spent my time playing with Legos, make-believe, and reading.