It's was a critique of authoritarianism, using example of communist ideologies, in my opinion.
I didn't like the style, like in history textbooks, how they gloss over minute details? That's what I felt about animal farm. Like, it felt like most of the animal farm was written by a distant observer, not someone who lives on the farm. Most notably the book lacked first person dialogues. It was almost entirely written in indirect speech, except for a few moments.