Needing a break from non-fiction, I decided to experiment a bit by reading two sci-fi series.
The first, "Wool," is a current phenomenon on Amazon.com. I read books 1-5, and thought they were fairly enjoyable, but not that memorable. I expected more given the phenomenal average rating the series has on Amazon and Goodreads. Book 1 is really great, but the rest is just 2.5 star material.
The second series, which I HIGHLY recommend, is the Foundation trilogy by Issac Asimov. I chose this trilogy because it topped so many "greatest of all time" lists. Asimov was a prolific writer - he wrote 470 books in 9 of the 10 Dewey Decimal categories. He began Foundation (book #1) when he was just 21, which is incredible given the depth of language and plot in the book. Foundation and Empire (book #2) was similar to The Two Towers from the Lord of the Rings trilogy - it was entertaining, but lacked the novelty of the first book and the revelations of Second Foundation (book #3). Second Foundation was my personal favorite, which several memorable characters and plot twists. 4/5 stars for the series.