It's been a while since I've read the book, but for the most part the show captures the feeling of dread, hopelessness, and frustration the animals felt on the farm. As with any condensation of book to movie details are lost, but the overall scope remains intact.

The major problem with the movie was the ending. The book ends with the animals not being able to tell the difference between pig and man (a scene which is done pretty well, but could have been better). In this version, we still have ten minutes left. While I can't spoil the ending (though it's not much of a spoil), let's say it feels incredibly unrealistic and improbable given the situation. Then there is a final monologue about hope. Blech. All movies are equal, but movies with bad endings are less equal than others.