Someone mentioned the National Review review of Atlas Shrugged. It was actually written by none other than Whitaker Chambers during his brief time writing for NR. Best quote:
I've heard that Ayn Rand was so upset by the review that for the rest of her life, if William F. Buckley ever walked into a room she was in, she immediately left the room.
That being said, I do agree its an important book to read, if only to be able to refute its faux intellectualism to anyone who ever tells you that they're a big Ayn Rand fan. I definitely skimmed the 100 page speech towards the end of the book though.