On the PSP it seemed to be too linear for me. The idea was to reach the next objective by driving or running there, and Optimus Prime is the slowest bot of them all so driving or running didn't really get you there all that quickly. I was expecting it to be more of an open city where certain events would occur and you would try to get there asap, kind of like Spiderman, Superman, Crackdown, any of those open sandbox games. But it wasn't like that. Like I said, it was linear, it's just a one way street.