I'm EXTREMELY 'picky' when it comes to BUYING a book!
After all, it's my hard-earned money paying for it, so I choose very, very carefully!
Fortunately, I know what I want, so there's not a problem!
Library books are borrowed on the premise of a review or recommendation from someone. If I can't 'get into it' by end of the first chapter, it's back to the Library's 'drop chute' for it!
Sometimes I just do a 'Clayton's read' ie the reading of a book, when you don't have a read of it! This is done by reading, if 'plot' worthy, of just the First & then, the final Chapter. If liked, will read book from Chapter II, if not, same fate as above!