The art for these new marvel shows are disappointing cause there’s no real art style. Usually it’s a business decision to make easier toys like how the 80’s had characters with similar action figures physiques and it’s annoying cause it impacts the show’s quality.
Compare marvel animation now to how it was in the early 2000’s . The character designs truly varied in quality, spectacular Spider-Man wouldn’t have been as spectacular as it is if it had current marvel animation.
Even an old show like "Iron Man: Armored Adventures" was visually underwhelming. Bad by some accounts. But it had personality and effort. MTV's Spider-Man was very experimental and thankfully short. And the X-Men have seen more hits than misses.
Well big hero six could be a good starting point. Though it is based more on the movie than the obscure marvel comic.