Avatar is probably one of the greatest cartoons I've ever seen, and Gumball has my favorite visual style of any cartoon ever. I also happen to really dig Batman TAS and Rocko's Modern Life.
Weird, right?
There aren't nearly as many good cartoons now as there were in 90's so that's true by volume, but that doesn't mean that the good shows of today don't measure up to what was good then.
Have you ever heard of opinions? It's just like the people that says the only good Pokémon generation is the first,and hate on people for liking any others.
Weird, right?