I’ll tell you what you are missing…
The fact that Disney Pixar movies are very cgi driven in a way that DC are not, and Spider-Man: Into The Spider-Verse from Sony felt very Disney Pixar as well in alot of ways due to it’s art style. Some Disney Pixar films are even semi-realistic, and Spider-Man: Into The Spider-Verse appears photo-realistic in it’s chase scene.
If you can get past the difference of animation/art styles in DC films then you’ll allow yourself to enjoy some great films with some great plots but the argument is no different from someone saying “I won’t play PS2 when I can have a PS4, PS4 is so much more hi-rez.” But DC films often have far better voice acting than Disney Pixar films - or at least in my opinion.
At the same time, not sure if asking others what your problem may be is going to help. If you’re not interested in Superhero animated films, you might just not ever change your mind. Can’t tell you how many times I’ve played a game or watched a movie and tried to force myself to like it - at the end I never change my mind. There’s nothing wrong with you, if you don’t dig it then you don’t dig it. Even if the rest of the world enjoys something, you’re not wrong for not going with the flow.
It’s reay a matter of you honestly asking yourself “Can I get over the animation/art style difference?”