People were saying this for as long as I can remember. There are good cartoons out there, but cartoons tend to be underestimated and/or not taken seriously by mass media unless it's anime.
Active Worlds. It's also one of the oldest still running 3D online games, though the community is very small. I've been on Active Worlds since 2007. Also Vinny from Vinesauce did a video on Active Worlds, but the stuff he explored was an EXTREMELY small portion of what Active Worlds has to...
I found out about 9 around three years ago, got interested so I watched it and I really enjoyed it. I discovered it when I was on TV Tropes looking at various examples of tropes in media.