I don't know anything about the new shows, I admit (everything since 1999 on Cartoon Network is new for me). However, I do notice the difference in animation and plot quality between late 80s and early 90s shows such as Captain Hero, He-Man and Dink the Dinosaur and late 90s shows such as Cow and Chicken, Dexter and Johnny Bravo. I like the old ones better, and Cow and Chicken is downright morbid in my opinion (cow and chiken eating sausages (in graphic detail), topless parents and a naked devil jumping around on his butt). I liked Spongebob though. I had been watching it on Super RTL for years, just like I had been doing with Darkwing Duck (I recognize the villain in Ptyra's avatar), The Gummybears, Arielle the Little Mermaid, Chip and Dale. All dubbed in German, of course.
I think every generation will think the cartoons it watched will think those cartoons are the best, along with the cartoons watched by previos generations.
Anybody doesn't like Tom and Jerry or Looney Tunes?
I thought so.
Our children will inevitably watch and like cartoons that we wouldn't like. And it will be the same with their children. However, we may yet hope that the cartoons we watched will become classics in their eyes. Just as Looney Tunes is immortal, so maybe the same will happen with The Land Before Time.