I read Lord of the Flies for the first time about a year ago. I'm currently using it in a class I'm teaching about government. Lord of the Flies seems to be one of those books that people frequently read in high school. I didn't read it then, but when I recently read it was somewhat glad. I don't think I would have appreciated it as much back then.
I mentioned this recently with my reread of Catcher in the Rye, but as an adult, I actually get why books are assigned in high school.
Lord of the Flies is about a group of boys stranded on an island after a plane crash. The boys create their own system of power which gives a great allegory to political life. I think the symbolism is really easy to find, but I don't think it's overbearing. Each of the characters and their power says something about political power. It also says a lot about how people act in the absence of an authority figure.
If you were a fan of Lost, the TV show, I don't know how you couldn't be a fan of Lord of the Flies. Plane crash, deserted island, disputes over leadership, etc. Once on the island, all hell breaks loose and the story is the struggle of the boys' survival.
I obviously found it to be an important enough read to use in class. It's a classic that deserves that label.
The next book on the schedule is Funny in Farsi by Firoozeh Dumas for the section on immigration.