Despite what you say about a lacking plot, which you may have exaggerated, you still call him a "fantastic author." Which is either irony or there's something to that.
It's not necessary for a book to have a great plot, to be a great book. I haven't read any of this guy's work, but Murakami has a similar "thing" going on... the plots in his books are often fairly dull and leave a lot of plot-lines unresolved... but yet the books are very enjoyable and thought provoking. It's almost like it's the atmosphere that matters, not the plot itself. Perhaps this author writes something similar?
It's not necessary for a book to have a great plot, to be a great book. I haven't read any of this guy's work, but Murakami has a similar "thing" going on... the plots in his books are often fairly dull and leave a lot of plot-lines unresolved... but yet the books are very enjoyable and thought provoking. It's almost like it's the atmosphere that matters, not the plot itself. Perhaps this author writes something similar?