Well, I agree. As much as I like Rodriguez

t: ... no one in their right mind would put him in Scott, Spielberg, territory. I wouldn't. But, Michael Bay is definately not up there either. You actually think he is???
Well you mention "echelons." If you were to ask me (and I know you didn't), as a movie buff, these are (some) of the echelons I see (not in order of goodness):
1) "Pop" directors. Some critics call them hacks. The Puff Daddy's and NSYNC's of cinema. Examples: Roland Emmerich, Brett Ratner, Michael Bay.
2) Auteur directors. They garner cult followings. You discover them in your freshmen year in college through word of mouth... "you never heard of El Mariachi! You're kidding!" Examples: Rodriguez, Carpenter, Sam Raimi... and even Tim Burton. Lots of others. Cronenberg being another good one. They're Iggy Pops, Ramones, etc of Cinema.
3) The Masters. They mix 1 & 2 in a perfect way. All the pop success of 1 with the art and depth of 2. Examples: Spielberg, Scott, Cameron. The Beatles of cinema.
Really, I think Transformers deserves better than the Puff Daddy guys. That's all.