The common complaint I'm hearing from everyone is there isn't enough character development of the robots. The only characters that they're focusing on are Prime, Bumble Bee, Megs, Screamer, Jetfire, Twins, and the Fallen. During any normal motion picture, the movie generally centers around the 2 leads and a few supporting characters. ROTF is following the same protocol of any normal movie, by focusing on it's 2 leads, and a few supporting characters. In a comic book, or cartoon series, you have a full season to develop each individual character, in 3 a part trilogy, you don't have that liberty. Don't get me wrong, I agree with everyone that more development is better. However, I don't think it's ever going to be possible in the movie-verse due to time constraints.