The Fountainhead has value in that it helps teach you that there are people who think like Ayn Rand. I wouldn't say it's particularly realistic, though: there are better books to learn about the world through. (But if you read more than two or three books, you'll quickly learn the problems with Ayn Rand's worldview.)
Books aren't mutable in the same way that arguments are: you can actually sit and dissect a book, in a way that you can't dissect a politician's rhetoric or a parent's scorn. So… kinda, yes: even The Fountainhead is worth reading, to some people (not that I'd recommend it).
