I've started to rewatch two shows right now: Spider-Man: The Animated Series and Mutant X.
Spider-Man: TAS, for all it's flaws, is still a pretty good series. Mutant X, on the other hand ... well, let's just say that there are only two good things about Mutant X: Tom McCamus as Mason Eckhart and Lauren Lee Smith as Emma deLauro, and she only gets good in the second season. Everything else? Mindnumbingly stupid. I can see why I liked this show as a kid.