Well, just saw it. I'm not a huge fan of the series to be honest. I enjoyed the semi-originality of the first one though.
Spoiler
There was absolutely no purpose to having the girl there, at all. She contributed nothing! The part that got me the most was when she's staring off while autobots or decepticons are being destroyed behind her, and she is nearly spotless. While Shia is all battered and grimy, she is impeccably clean, makeup all in place, perfect clean unwrinkled white dress hanging off her. Like, what the hell. Lots of action, no story. Frankly, some of the explosions were bad, and that's dreadful considering the whole movie is built on that premise, boom.
Example, that sector 7 guy is driving down the highway and 3 black suv's are chasing him. First one pulls sector 7 guy out of his car and something leads to another and one of the black suv's, after transforming, flies up and flips into those green billboard things on the highway that tell what route you're on or what exit is about to come up, and the robot doesn't even dent the billboard, yet you see the flashy glitter explode behind it, and it falls on itself. The whole spot was horribly done and was a bit shocking in that aspect. Oh well, not my thing. I really enjoyed the previews for the new Mission Impossible and Captain America.