For more than 60 years, Disney has been delivering quality entertainment in many different forms. While all their divisions deliver robust growth, the film and TV segment deliver the best aspects of all that is Disney, and that's due to two simple worlds:
People can have different opinions about movies. However, sometimes a movie just knocks it out of the park, and earns near-universal acclaim. That's usually because it tells a great story, and does so in a unique way.
Disney films have traditionally been very good and the company has shown great foresight by purchasing three purveyors of great storytelling: Pixar Studios, Marvel Studios, and LucasFilm.
Each studio has cultivated a corporate culture with a mission and a vision. They all have had management that was able to execute on their respective visions.
There is a braintrust at Pixar that has permitted it to deliver an almost-perfect record. Although movie reviews site RottenTomatoes.com isn't a definitive measure of quality, it is a pretty good one. With the exception of Cars 2, every Pixar film has over a 75% rating, with many at otherwordly 99% and 100% ratings (the number is the percentage of professional reviews about a film that are positive). While it is also true that its latest films haven't soared, they still deliver on the whole, and will likely continue to do so.