There have been about 125 theatrical releases in the U.S. (not counting nature and documentaries). The overwhelming majority have received middling to poor reviews from critics and audience. Sure, there's been about two dozen really good ones... in over 50 years and 125 movies. That's a horrible record. Additionally, the majority lost money in their theatrical window.
Now, the quality of the garbage has gone up recently, but those big budget flops, while great on the eyes, grate on the brain and on Disney's bottom line.
Compared to Pixar, Marvel, LucasFilm, and Disney Animation; Disney Studios is a business failure. Don't know how Disney, the corporation, tries to squeeze a few extra dollars from the parks which is making them billions, but lets the Studio slide that can't turn a profit in its theatrical window.
The average critic's rating for all Studio films is 55 and the audience rating is 64 (out of 100).
Compare that to Pixar (79 & 75), Marvel (70 & 77), Star Wars (72 & 74), and Disney Animation (70 & 71).