The main problem I have around here is people who drive fairly normally on the straight bits then slow down really excessively on corners, accelerating away again so as to be impossible to pass safely/legally on the straights but slowing again to a real crawl into bends. I don't tailgate them or get aggressive, but it can be quite frustrating sometimes. I can undertand it (and do it myself) in areas where sight-lines are bad and there may be pedestrians, horses or wildlife concealed by a corner, but when sight-lines are good I find it a bit of an odd way for someone to drive.