It would appear that most people hate this film because they are unable to grasp the inner concepts that this film was built around while appealing to a braindead audience who are easily amused - most people just see the stupidity. Let's attempt to break it down, though.

Our heroes in the film are Emojis, but it really doesn't matter what they are, but rather, what they represent. Like Inside Out, Toy Story, Winnie the Pooh, or virtually any other kids film, the main characters are simply personifications. Their outward expressions and the world's expectations for them to keep those expressions is social commentary on how people are supposed to act in public, or in their professions. The Meh emoji represents inner turmoil at believing there's more out there than the safe expectations of society, he is an explorer, and societies differences give him depression.

People have also complained about the plot about needing to reach Dropbox. Dropbox is yet another metaphor, just masked in something relevant to the setting. Exactly like Mount Doom in Lord of the Rings. It's an adventure story with plenty of heartfelt, meaningful messages and diverse, colorful characters

This is Man vs self, man vs. faith, man vs destiny, man vs society, and man vs industry, depending on which character is focused on. The characters are well-rounded, as they all have individual character goals, motivations, and growth, all of which aren't without healthy flaws that act as obstacles to get them where they need to be right away.

Hate for this movie makes no sense to me. It's relevant, the visuals and animation is pretty great, and a lot of thought was put into making it smart all around