While the upcoming Transformers: War for Cybertron lets you play as actual Transformers, its multiplayer mode also lets you create your own Autobot or Decepticon and, as my people would say, get amongst it.
Sadly, the customisation options seem to extend to "pick a team" then "pick a hue" (hopefully there's more to come later), but if that's got you down, the copious amounts of gameplay footage towards the end should bring the whole clip back up to a par.