This book is so brilliant in its straightforward way of showing the manipulation, narcissism, cruelty, slavery and inequality involved in communist regimes, fascist doctrines, and totalitarian tyrannies. 

The book’s utter simplicity in writing as well as content is exactly what makes it so powerful. 

The bitter irony of this story is that I think Snowball could have actually made it all work fairly and efficiently for everyone on the farm, but unfortunately the right people are never the ones (who stay) in power, either through corruption or through sheer stupidity of the masses. 
That’s also why, although communism is nice in theory, it can never become reality as it will always be ruined by the innate evilness and selfishness of men (or pigs, in this case).