My basic problem with Kids Next Door is that it tries too hard; you're suppose to posit this parallel world where kids are hi-tech heroes, keep in mind its relationship with the real world, so on and so forth...by the time you work out how the humor's supposed to work, well, it's too much work, for the poor qualtiy of humor. Even the credits--writing operative, directing operative--they've thought it over too much. It's like one of those overconceptualized Disney rides (actually, they ALL are).
Spongebob Squarepants, on the other hand, is dementedly brilliant. Hell of a lot more fun than that sodden fish movie, Finding Nemo.