I don't consider shows that I grew up with, like Full House, a guilty pleasure. I consider those more like comfort shows, even if I am a little embarrassed to admit I still watch some of them.
The main show I consider my guilty pleasure is Jonas. At first I thought it was a little lame and didn't think it would last but it grew on me. Definitely stupid humor, but still funny. Other shows would be Lizzie McGuire, Even Stevens, Drake & Josh, the Amanda Show, iCarly and Spongebob Squarepants. I prefer Nickelodeon to Disney

Oh and I can't forget Mary-Kate and Ashley's tween show, So Little Time. I actually own the whole season!