I don’t buy the Michael Bay stuff. I don’t personally like his films, but his films always make shitloads of money. I don’t think that qualifies him for the worst director. He is able to entertain large amounts of people.
Plus, even though I may not like him, when I heard that he was directing the Transformers movie, I was actually happy. Because all people want to see in a Transformers film is fighting robots and big explosions. Character development and drama would be pointless.