I was out shopping earlier, in a bookshop, surprise, surprise.
I picked up a few and put them down, when it suddenly struck me, I had probably rejected about 8 to 10 books.
So, I went back to see what the problem was.
In all but one of the books, the first sentence didn't grab me (yes I am saying I only read the first sentence - if I am busy, I have less time to spend - I get extra choosey). The one where the first sentence was promising, the first paragraph let the story down.
I didn't waste time reading on, I just left 'em.
Never, underestimate the importance of the opening.