Ayn Rand

Atlas Shrugged starts to get repetitive about midway through. Not the plot or characters, but the philosophy. There are only so many ways you can iterate the same idea before the reader starts to feel as if they're being hit repeatedly over the head with a large hammer. I started skimming about 2/3 of the way in anytime someone spoke for more than two paragraphs on the central philosophy, and most readers will want to skip the 100-some-odd page speech towards the end of the book.

Even if you don't agree completely with Rand's philosophy or economic theory (and there are very few who do), the book is still quite enjoyable as the characters have a lot of depth and very robust personalities, and they grow and change as the story progresses.