No, it's not you.
Bestsellers *are* purposefully written for greater accessibility.
As he points out, in the old days bestseller-dom was the result of writing a book that happened to please people. It was not a specific goal if the writer as it is with Patterson and many of today's brand name authors, who craft their books to formula, aiming at very broad appeal.
Like this:
http://blog.karenwoodward.org/2014/0...ful-prose.html
A typical Patterson chapter runs 640 words or so.
I've written longer sentences myself.