Next up is popular 90s Super Hero show, X-Men.

In the 90s, superhero shows managed a healthy existence without the demands of some big shot executives forcing it down our throats; Spiderman, Batman and X-Men are still highly regarded as the best cartoons of all time and not many people would argue that statement; and while we know why the former two were popular, X-Men was popular for a different reason. X-Men taught it's audience about grey morality, something that's not touched upon anymore in cartoons; it's more than just a showcase of mutant powers, it's how you deal with those powers and how regular people react to them and how to deal with constant hatred from said regular people.
Also it doesn't just offer you one solution it offers you two; you can decide to follow Professor X, attend a safe environment where you can learn to control your powers and learn how to reconnect with the world that's isolated you.
Or you can follow Magneto and turn against the human race, declaring yourself the next stage of evolution.
Being honest, both sides have good arguments, even though it's obvious that you should be supporting the X-Men, the grey ambiguity of the human race makes it hard to believe that Professor X can make such a peaceful world when they send giant sentinel robots to capture and execute you, equally I wouldn't put my faith in a leader who helped send in the sentinels to prove a point.
The characters are also rich in complexity with little room for mistake.
X-Men is not perfect though, it's humor turns up in strange places, Jubilee is not that interesting yet they focus on her too much at times and the Phoenix saga was the show's low point.
Other than those nitpicks, I loved the X-Men cartoon, the cartoons that followed never really captured the same formula the original did, which is a shame because there's so little to get wrong that it's hard to make this franchise bad.