I also try my best to finish reading anything I've started. That's why I painfully, agonizingly forced myself to finish Stephen King's The Stand last month. Can't understand how so many people at AW gush over that novel and claim to have read it multiple times. I mean, King is a polished writer, but his work is slick entertainment, not literature. With one life to live on this planet, I sure wouldn't waste one minute of it reading The Stand again, when there are millions of other books to read.
My local independent bookshop owner kept pushing me to read We Need To Talk About Kevin by Lionel Shriver. Maybe if I was a woman and a mother I might appreciate all the minute details and female angst, but I'm kind of forcing myself to read ten pages at a time, once every other month, then break for something I actually enjoy. I don't know why I can't just abandon reading it.