I'm on the fence about seeing it. I agree that the robots look too "modern" and intricate. I wish they did it in a more "cartoony" way.
I actually didn't like the way Megatron's face looked in the pics before seeing the movie, but the way Micheal Bey decided to go with a very realistic rendering of the characters - to me, paid off when you watch the movie.
Unlike the Power Ranger Megazord style of live action, which I believe is what you mean by "cartoony", Micheal Bey's Transformers look very real, very intricate and complex, and very convincing as they would if they actually existed. I believe that is what helps set this movie apart as fantastic, because Optimus Prime looks so real and NOT like a Megazord knock-off with the right colors.
Again, I was a skeptic about the *new* styles for the bodies, like everyone, I'd have preferred Starscream to be his memorable red and grey, and blue. But, when you see the movie, it makes sense that they are based more on a highly realistic, modernized interpretation. And that fact that all their original personalities are there makes it even more convincing.
Bottomline, how many here saw the movie and don't want more more more? And I think that says it all.