I'd bring Doug and Angry Beavers up two, but otherwise this ranking is solid. (I never watched Hey Arnold, though)
And for Cartoon Network shows, Courage the Cowardly Dog seems to have held up the best to time, but it's always been my favorite so I could just be a little biased. Samurai Jack, Johnny Bravo and Dexter's Laboratory also have held up impressively. I honestly never watched Powerpuff Girls back then, but my love for MLP: FiM spurred me to finally give it a shot and I regret nothing. It seems pretty solid, too.
--
Essy, Avian Enthusiast