I'll go with this quote from Roger Ebert:
"It's goofy fun with a lot of stuff that blows up real good."
AND I will say that someone, somewhere (probably a room full of people) put some serious thought into how things transformed, which is pretty impressive for a movie called, oh, I don't know, Transformers. Oh, and it was very, very funny. John Turturro in particular was very, very funny. And one doesn't get to say that very often.