For one of my classes at university, we read three dystopian novels and then discussed their relations to modern philosophy. The conversations were actually really interesting, and I enjoyed the class enough that I wanted to read more dystopian novels to see what other strange visions of the future authors from decades ago had, or perhaps even more recent works, ie The Hunger Games. As you can see from that last example, the themes behind them don't need to be as dominant as Orwell's were, or nearly as philosophical and satirical.
Some dystopian novels I've read:
The Hunger Games trilogy
Brave New World
I'd love any other suggestions, and for those of you who haven't read Vonnegut's Player Piano, which would be understandable since it's certainly not his most famous work, I strongly encourage you to read it. Best satirical writing I've read in a while, and the themes are extremely relevant today, as they deal primarily with how you handle unemployment when manufacturing declines sharply due to technology. Amazing book.
Anthem by Ayn Rand.
Animal Farm by George Orwell.
Lord of the Flies by William Golding.
Atlas Shrugged by Ayn Rand.
A Clockwork Orange by Anthony Burgess.
This Perfect Day by Ira Levin.
The Children of Men by P. D. James.
Battle Royale by Koushun Takami.
Honorable Mention: V for Vendetta by Alan Moore, a Graphic Novel which focuses heavily on Dystopian themes.
I don't have a great deal of experience with that particular sub-genre, but I think The Chrysalids by John Wyndham and Chung Kuo by David Wingrove (only read the first book in the series, so far) fit into the category and were enjoyable reads.
To follow Rand you must put aside all morals, all humanity, and your religion must be self interest and selfishness. It requires one to literally become a sociopath. It goes against the basics of our species. It is to believe that any self sacrifice for others is wasteful and wrong.
A society based on her ideals would execute all old, weak, and sick. A group of unparalleled elite would hold all other citizens in slave-like bondage, and there would be no relationships based upon anything besides self interest. Her ideology is a fantasy with one rule, the government shall not infringe upon peoples rights. The problem is if you follow that system, someone will climb to the top of the pile and take control, and they will infringe upon peoples rights.
Its like believing an unregulated free market economy won't lead to bondage and monopolies.