So I've been rewatching this series recently to see if it holds up. In all fairness, yes, I think it has. I think its a fun, brilliant love letter to not just the Silver Age, but pretty much DC's mythos. As for the best superhero animated shows, here's my personal list:
1. Batman: The Animated Series
2. Spectacular Spider-Man
3. Justice League and Unlimited
4. Batman: The Brave and the Bold
5. Young Justice
6. The Tick
7. Avengers: Earth's Mightiest Heroes
8. Teenage Mutant Ninja Turtles (Mainly the 2012 one)
9. Teen Titans
10. X-Men (1992)
1. Batman: The Animated Series
2. Spectacular Spider-Man
3. Justice League and Unlimited
4. Batman: The Brave and the Bold
5. Young Justice
6. The Tick
7. Avengers: Earth's Mightiest Heroes
8. Teenage Mutant Ninja Turtles (Mainly the 2012 one)
9. Teen Titans
10. X-Men (1992)