It is something that you cant hate because of every single details of the storyline. Plus, these type of movie isnt something that we can hate easily since its all based on graphics and not live action. If it was a live action movie, we would all be saying something about some particular person that may not fit well with the character. Example would be Captain Marvel character. Lots of mix reviews with Brie being the character and not someone else who is better in acting.
Storyline comes to mind as one of the most important things to the promotion of a movie. I also think that since its geared more towards kids that they have to have a little extra deeper meaning for adults (in order to peek our interest too).
They appeal to all ages with an interesting story The colors attract children, and adults feel nostalgia from enjoying such a colorful creation so much as they look into the movie's deeper meanings