I knew the story, yet had never read the original. A clearly written text and great read.
I was surprised to find myself laughing from time to time -- at the cat who doesn't seem to grasp what's going on but actually doesn't really care; or at the pigs when they discover alcohol.
In my reading, I am always interested in "the construction of evil" or what you want to call it. Orwell apparently follows history by taking inspiration from the Russian Revolution. The plot is believable in some aspects, however it relies on the population of the farm not being smart enough to understand what's going on, while it's pretty clear for the reader right from the start. What interests me also, are other ideas of more subtle ways of turning evil. Animal Farm tells a different story though, and that's okay.