They're largely spoofing old cartoons, as is Dexter's Laboratory. I guess if you haven't seen the cartoons they're spoofing you might not like them as much. If you've seen them, it's hilarious.
But then, American cartoons have been without redeeming value since Pinky and the Brain went off the air.
Pinky and the Brain was good--actually the Pinky and the Brain shorts on Animaniacs were even better IMO--but there have been a ton of good superhero cartoons since then. Most cartoons these days suck compared to older ones, but the superhero ones keep getting better and better--the various versions of Batman, Superman, Justice League, Spiderman, and X-Men, among others, are all very good.