How Transformers 2 The Game should have been designed:
The game shouldn't have followed the film. It should be set between or after.
It should have cinimatics to keep it interesting and keep the story going.
They should have had some sort of 'race to the checkpoint' bits in between to take advantage of the vehicle modes.
There should be areas you can only reach as an aircraft or car to utilise these.
They should take notes from the developers of Transformers on PS2, which was the ultimate transformers game (minus online though).