Any animated series still worth watching as an adult?

Just came up on the 1994 Spiderman animated series opening on Instagram and nostalgia flooded me, I remember it being peak. I also remembered watching the X-men series in similar style and loving it.

I just got into Marvel comics and I'm thinking about revisiting these shows and checking out some other ones, but not sure if they are only aimed at kids or not. Are they like Avatar Last Airbender that you can still enjoy the same as an adult?