Having flown with a handful of the people on the list I found the descriptions accurate. I'd classify most of them as "prefer not to fly with again if at all possible but I'll do it if I have to". I'm on my 3rd airline and 18th year in da bidness and while there are definitely exceptions to the rule the people who make it on the type of list we were emailed about have earned their spot and I for one appreciate getting a heads up about them.