Yeah. I'm pretty sure Mason was being sarcastic. Unless his school really is that bad.
But, to answer the question, the best book I have ever been forced to read would have to be The Giver. Well, we didn't actually read it, it was read to us. But, I found the entire book interesting, as I do enjoy science fiction, and I like to imagine what the future has in store for us. What if the government turned it's people into placid, and emotionless drones? How is there no violence or war in this time? How long did it take for the government to do this? A number of questions formed in my head. A number of them were not answered in that book, driving me to read the other books in the companion series.
Now, here's what I like about the whole companion series aspect of The Giver. The Giver is the first book in the series, it ends with (*Spoilers*), (Jonas basically falling off a sled into the snow, and seeing a strange display of lights. ) Now, you can assume the worst, or the best. Is he (dead) or is he (alive)? You can stop reading, at the end of the book. There's no real cliff-hangers. If you don't read the other books, you're necessarily missing out on anything. The other books in the series each have a different main character. (Yes, you can see Jonas. As he is the leader of the group of people he found.) Each books highlights a new person, and how they grow. But, you don't have to read all of them. You can read any book separately, and still understand what is happening in the story. This helped me enjoy the series even more. if you read them in sequential order, you see how each character's actions helps to spur the story onward.
But hey, that's just me.