So I've rewatched ROTF with directors commentary. Wow. If as much effort had gone into everything else as effects, these films could have been awesome.

At one point in the space of 90 seconds Bay and Orci lose track of which of the "many MacGuffins" (their own words) our heroes are after, and have a debate over whether the Arcee triplets have been destroyed yet because they lost track. Fun fact - turns out they were all meant to be destroyed, the effects team only animated one, and no one bothered to go back and rectify that.