Life is much too short to read bad books. When I find myself stuck in a horribly written/poorly plotted/boring book, I back out immediately and put it up as a lesson learned. And I never visit the offending monstrosity again.
As such, I don't really remember what these books are.
But I would have to disagree with Harry Potter books 1-4 being on a list like this. I rather enjoyed them.. but after that they just became whiny and irritating.
And I rather enjoyed Piers Anthony's Battle Circle.