With each movie, the new Transformers have been looking increasingly human. Like in the first movie, look at Decepticons like Blackout or Bonecrusher. Now look at Lockdown. He's got an almost human face and body shape, hardly any extra kibble on him. Even Autobots in the first movie looked alien compared to now. It makes sense that some Autobots like Hound and Drift would adapt more human faces to associate better with humans, but why would bad guys take that appearance? Also, Sentinel Prime looked human before he met humans. Wut?