Oooh, touchy!
I have seen plenty of people promoted and are useless at both the job they had, and the job they were promoted into.
http://www.newscientist.com/article/mg20427392.600-why-your-boss-is-incompetent.html
So have I, probably put a few there over the years too, but fact is they are usually a lot more competent than the people they manage in the main, though the people below often don't see that of course because they only have their perspective.
Good article mind.
