Basically, they're implying that all action movies are by necessity plotless, boring, humorless and full of characters you either hate or don't care about. If you demand one line of dialogue that doesn't make you gag, or one character you can relate to, these people will yell at you to buy a ticket to Atonement. (It's almost always Atonement, I think because the title is easy to remember.)
I don't want Transformers to be Atonement. I want it to be Die Hard or Iron Man or Terminator 2 or even True Lies. Cheesy? Over the top? Full of explosions and ambiguously sketched terrorists? Perfect! I don't care if the hero hangs the bad guy on a missile and fires it into a building while telling him he is fired, as long as he has a reason to do it, as opposed to just checking his watch and going, "Oh, it's time for this scene in the movie."
Just because we want smarter dialogue than "Bumblebee, stop lubricating the man!" doesn't mean we want characters talking about feelings or commitment or the meaning of life. There's hundreds of levels of dialogue intelligence between the retarded lines given to Sam's parents and a Shakespearean soliloquy. "Yippee-ki-yay, m**********r" will do just fine for a "dumb action movie," and even "Yippee-ki-yay, Mister Falcon" would be an improvement.
Damn TV edits.
In fact, if Optimus Prime had said that exact line while Bumblebee peed on John Turturro, it would have significantly improved the movie.