What I really loved about the first 3 movies was that you could see, in their robot forms, the individual pieces that would become the disguise in the vehicle forms. Just watching every piece move by itself and connecting the dots, seeing how they transform and how it all fits together. That's the essence of the visuals in the movie and why the last two films fell so flat.
T1-Cybetronic transformation T2-The feels are like aliens transformation T3-The major general cybetron transformation T4-Bionic and Digital transformation