confused and badly written papers is much less pleasant than refereeing clear and well written papers. But often the confused papers have a gem of an idea hidden in them—you just need to find it. And the well written ones can be vacuous.
There is a theory that says that you should put all your ideas into the paper, hoping that the referee will figure out which one is good and help you figure it out. I never believed that theory, but I realize that I often unwittingly provide supportive evidence in my reports.
My head hurts today.