Samurai Jack is an American animated television series created by animator Genndy Tartakovsky that aired on Cartoon Network from 2001 until 2004. It is noted for its highly detailed, outline-free, masking-based animation, as well as for its cinematic style and pacing.
Cartoons I would still watch as an adult, not always for nostalgia but in a few cases. Note: Anime is not cartoons so I won't track those, I have an anime-planet account for that.