>>104349641I feel like people don't get that there's a difference between design and style and art.
SU is poorly drawn with a lot of very blatant errors, but a good amount of the designs are actually really memorable and well done, as evidenced by the fanart where they actually look good.
Not all the designs are good of course (garnet's ovel shaped upper body is questionable and steven himself is fucking hideous), but a good 60% of the gems are actually really well designed.
Think about it like this; I could post fanart of one of the gems drawn in a completely different style from the show, and chances are good you would know that it's a steven universe character, even if you can't necessarily attach a name to them.