Teenick is way too stereotypical... especially that new 6teen show they are spewing out. Like every teen works at the mall, has perfect friends, and whatnot. DUMB. In all honesty i'd rather watch Nick Jr. I like the spider show. Haha. It's great. My baby sister loves it.
They're not stereotypical only, but that the given humor and premise is similar with all the other shows on the non-Teenick block (save for Nick jr). Once you rip off high school (and the sordid cliques associated with it), they're the same.
Add high school to Hey Arnold, it's on Teenick. Anime's better on teens, transporting them into other situations like fantasy and science fiction and stuff, beyond high school-type humor. Negima's a better example of magic high schools when combing HP style magic and slice of life high school into one.