It's the opinion of any academic philosopher who has ever reviewed her. It also has nothing to do with her individualistic/libertarian view - Nozick, for example, who shares many of the same conclusions wrote a detailed review of her books in which he exposed her arguments and philosophical analysis as barely at an undergraduate level.

This is why Nozick and others are taught in political philosophy and not ayn rand. You can listen to a somewhat detailed introductory treatment by people well-read in philosophy here: http://www.partiallyexaminedlife.com/2013/07/01/ep78-ayn-ran....

One of her greatest sins is her perpetually trashing people like Kant whilst having no idea what theyve said - because she makes many of the very same points. pg does this too.