Soooo....no, then.The entirety of the DCAU (DC Animated Universe) by Paul Dini and Bruce Timm, stretching from Batman: The Animated Series in 1992 to Superman: The Animated Series in 1996 to Batman Beyond in 1999 to Justice League in 2001 (which became Justice League Unlimited in 2004), along with Static Shock (which wasn't DCAU at first, but incorporated into it later with guest appearances from Batman, Superman, and the Justice League in the second through fourth seasons) and The Zeta Project (spun off from Batman Beyond). Outside that, in the 2000s and onward, we had Teen Titans, Legion of Super-Heroes, The Batman (which did improve as it went on), Green Lantern: The Animated Series (shame it only lasted one season), and Young Justice.
On the Marvel side, there were the 90s X-Men and Spider-Man cartoons, followed by the second seasons of the 90s Iron Man and Fantastic Four cartoons, and the first season of the 90s Incredible Hulk cartoon, as well as the 90s Silver Surfer cartoon. Then in the 2000s, we had X-Men: Evolution, Fantastic Four: World's Greatest Heroes, The Spectacular Spider-Man, Iron Man: Armored Adventures . . . and even in the early 2010s, there was The Avengers: Earth's Mightiest Heroes.
And of course . . . outside both Marvel and DC . . . Spawn on HBO!