Tim Burton movies have looked ghastly for years, no matter the studio, though if any film has a worse aesthetic than his Alice in Wonderland it's the live action remake of Beauty and the Beast. Like Captain Marvel's directors clearly working separately from the 2nd Unit (action) director, I don't believe Bill Condon had any control over B&B's Art Direction, which needed serious pruning. (Kenneth Branagh's Cinderella was lavish, but in a scaled back way so that you could appreciate the touches.)
What's helped Disney stay above most (with exceptions) is the realistic blending of live action and effects. Starting with the scene in Winter Soldier where Captain America takes out a jet, I realized that anything was possible given the proper amount of time to make it real. That has only improved right up to the creation of Thanos, which looks like actual Josh Brolin wearing excellent make-up.
Compare that to Warner Bros. From the DC films - Shazam looks like a Power Rangers film - to The Crimes of JK Rowling, which defines hot garbage on a dark and/or stormy night. The effects look like a video game roadmapped over theater sets filmed with not enough lights, but a lot of post-production tinting. Mad Max: Fury Road was the exception for the studio and even they weren't expecting it.