Excel Saga? Cow and Chicken? really?
I watched Excel Saga going by word of mouth alone, and I HATED it, just utterly hated it. So boring. I can only see a cartoon like that appealing to people who live and breathe anime (Nothing wrong with liking anime. I love Cowboy Bebop, Kenshin,and FLCL, I'm just saying a show like that, in my opinion, only appeals the hardest of hardcore anime fans and certainly shouldn't be on a list of the top 65 greatest cartoons of all-time. Just my opinion.)
I liked Cow and Chicken. When I was 12. I can't stand the show now that I'm in my twenties.
Don't get me wrong, I loved Dexter's Lab, but I also think that doesn't belong on the top 65 list. The characters were appealing, the concept interesting, the writing (most of the time), great. But the animation is just ugly & horrible. Compare a show like Dexter's Lab to Ren and Stimpy, The Simpsons, Talespin, Animaniacs.
PPG also does not belong in that list, for the same reasons. Also, I feel the writing wasn't that great. Lots of annoying dialogue. It had its moments, so it was far from being a terrible show (I loved the movie) but I definitely think it's an overrated program. "Good" cartoon, yes. just not GREAT.
Batman Beyond is a great show, so I agree with that choice. Space Ghost too.