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Michael Bay.
Metallica and Iron Maiden are bigger than Jesus.

It's funny that Michael Bay is always regarded as the quintessential unoriginal, unimaganitive, Hollywood hack but atleast he directed one movie that I really liked in The Rock. Which in my opinion trumps anything Ratner or McG have ever or will ever direct by a wide margin.
As far as who's the worst director, both Ratner and McG are equally sh-tty as far as I'm concerned. However Ratner has been given far greater opportunities and consistently put out garbage so he gets my vote.

I didn't believe there was actually a guy that gets money to film movies called 'McG' looked it up, there was, and he was culpable for Terminator Salvation and some Offspring Music Videos. That's pretty hard to top
Red Dragon isn't bad, Manhunter is so Miami Vice that's it hard to really compare the two, but I think Red Dragon is better even trying to drown the awful music and wardrobe out. So, he made one decent movie and a bunch of meaningless nonsense. His name isn't BRat so he's certainly not last on this list.
Michael Bay. I really hatb68e his movies but they make a fortune because they give idiots exactly what they want so he's the Sam Walton of cinema but there is something to be said for that, I guess. Being best at being worst is better than going by a 3 letter nickname and he's basically Spielberg if Steveo was sexed up, puerile and avoided any decent source material.

kill 'em all, let god sort 'em out

Michael Bay is actually a good director especially in comparison to the other 2.
The problem with Bay is that he has terrible taste. He goes overboard on action, sexy girls, and lame pop culture appeal. Other than that, he knows how to film a movie.