I can enjoy fiction, but I haven't sought to read a fiction book in about 15 years, so I guess my enjoyment was not very high overall.
Growing up, I focused mainly on non-fiction books about subjects I liked, or just read the newspaper to keep up on current events. When I reached my mid-20s, I became interested in reading every book that John Steinbeck wrote after I really enjoyed his novel Tortilla Flat. I continued to read and enjoy his books for several years, but only about two or three each year (which is virtually nothing to any serious fiction reader).
By my early 30s, I had read about half of all of Steinbeck's novels and short-stories, but about halfway through reading his 1936 novel, In Dubious Battle, I put it down after realizing that this story was the most frustratingly boring thing I'd ever encountered, and that it was time to try reading something else by any other author. I then read and loved a few fiction books like Fitzgerald's The Great Gatsby and Orwell's Animal Farm, but after a year or two, I just decided to stop pursuing new fiction books since doing so just didn't seem interesting to me anymore.
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DSM-5 Diagnosis: Autism Spectrum Disorder, Without accompanying intellectual or language impairment, Level 1.