I don't think it means that nobody is enjoying those books, it's just that their reputation is rather high, but their actual target audience is much more narrow, or that the writing style isn't something that most people enjoy .
For instance I abandoned Lord of the Rings. In my view it's poorly written, boring, long-winded and to difficult to follow. That hardly means that it's a bad book, it's just not for me.
I have read it. There is no “point” in it, as with any other novel. It is a huge style exercise by a gifted writer, as far as I can see. I gather lots of chapters are autobiographical or nearly so.
The book is obviously too long and it becomes boring at places but there are certainly extraordinary passages (in style and in feeling). But as with Wagner’s operas, delight comes at a price.
Exactly. The "point" is enjoying it. If you enjoy it, it hardly matters what it's about or trying to say, and vice versa. I enjoyed it, so that's why I kept reading and rated it 5 stars.