The Decepticons might be bigger, stronger, faster, and more maneuverable that the Autobots in Transformers: Revenge of the Fallen mutliplayer, but the Autobots have spunk!
This is the main with accurately depicting a battle between the opposing robot factions in the Transformers. The Decepticons can fly. Not only that, but in the Michael Bay movies they've preserved the scale of vehicle form versus robot form, so most of the bad guys stand at least double the size of the good guys. I suppose had we actually seen the Autobot side of things in this multiplayer walkthrough from GameTrailers everything would seem much more balanced, but from what is presented here, the Autobots are going to need to start easing up their recruitment restrictions.