Some books are just weird. It doesn't matter if they teach you about tyrannical governments or technology take over, they are just weird. Why force kids to read a book they will definitely hate which then causes them to not like reading? I'm all for students reading classics, some of them are just not necessary.
Orwell is a master of words. There is no arguing this. But I really don't think freshmen in high school understand Soviet Communism. Nor do I think they necessarily need to understand Soviet Communism. The allegory is creepy and disturbing. It is simple to read, the characters are stereotypical on purpose and while the themes are good ones to learn, they could all be learned through a more audience appropriate book like How to be an Alien by George Mikes. It has less creepy factor with similar themes.