I've only read one book by her, 'The Fountainhead'.
To be honest, I took it from the library quite at random (I think the librarian recommended it, but I did not delve into the plot too much), not having heard of Ayn Rand beforehand.
I remember the book left quite a mark on me, and I really enjoyed the reading itself. I'm not sure what it was- her style of writing, the actual plot, the way she describes the characters that makes you feel as though you know them - but something about it captivated me.
The fact that she combined all her opinions in the book doesn't upset me one bit, in fact I think that's a part of it's charm. If I remember correctly she was pretty young when she wrote the book, that also really surprised me...
I haven't gotten around to reading 'Atlas Shrugged', simply because the length of it, I guess... Is it anything like 'The Fountainhead' ? If so I guess I should read it!