I used to love X-Men (animated series). It was the only children's show I could think of where a main character dies in the first episode (Morph gets killed by Sentinels). Granted, they bring him back later in the show for an episode, but that show was deep!
However, I just watched them again recently and they are very...well, it is no surprise that I liked them as a kid and think they are childish now. Actually, I'll say the same for the original TMNT cartoon. Best line:
"Must have been kidnapped by ninjas!"
"How do you know?"
"Because they left rope that was made in Japan!"
Oh, what would and wouldn't be politically correct anymore...children today are weak.
-wtk