X-Men: The Animated Series
To be judged by no one. The 1992 Fox Kids series that made mutants mainstream, the Days of Future Past arc, 76 episodes on Disney+ and Hulu. 8.4 on IMDb.
Tag best marvel animated series
The Avengers: Earth’s Mightiest Heroes
The 100% Rotten Tomatoes Marvel cartoon fans still call the best Avengers series ever animated. Founding members one per episode, then the Kree Skrull war. 52 episodes, all on Disney+.