This game is good, but not what I expected
The first level is a tutorial with Optimus Prime. It lets you get used to the controls, even if they are a little awkward. Then you go on to play other levels with characters like Bumblebee and Starscream. Also, the game has a fixed storyline, which means that instead of picking Autobots or Decepticons, you will play as either faction depending on the mission. The graphics don't look that good and it is one of the game's major setbacks.
The robots don't move very fast and when you select their weapons you press right on the d-pad, but if you accidentally press it and you want that weapon back, you have to keep pressing right rather than just press left. A good point about the game, though, is the fact that you can customise robot's weapons before you begin a level. I've also heard that the game doesn't follow the plot of the film but i haven't seen it. There is an online feature as well but I haven't been able to use it.
Overall, I think this game is good and is worth your money. But if you are still uncertain then rent it first.