She said about reading Dostoevsky, (I'm not quoting), it's like being led through a lunatic asylum by a very powerful guide. (I can find the quote if you'd like it.)
She did appreciate Dostoevsky's writing and powerful plotting, but I think she short-changed him a little. One aspect of Dostoevsky that many people fail to appreciate is his wonderful subtle sense of humor. Humor was not Rand's strong point so that may be why she failed to appreciate it in others.
I do not meet many who appreciate Dostoevsky. So glad you mentioned it.
Hank