Movie tie-ins on Nintendo's handheld systems have almost always gone down the "cheap 2D side-scroller" route. With the arrival of the DS, developers have started to be a little more creative, but unfortunately still remain cheap.
Transformers DS is a nice surprise in that rather than being a quick cash-in, I get the sense that a lot of effort has gone into delivering the best possible experience that the DS could offer.
You are given complete freedom to go wherever you want (within reason - Transformers cannot swim) in four different locations taking inspiration from the movie. The gameplay is made up of story missions accessed within the locations that vary from defending a fellow Autobot to going postal on rival Decepticons.
The story is delivered using both in-game cutscenes and full voice acting, including the voices of Peter Cullen and Frank Welker, whom fans will really appreciate. Whereas the Decepticons version is somewhat more original with it's plot, Autobots follows the movie plot as closely as possible so you will be already familiar if you have seen the film.