The Transformers movies are incredibly divisive among franchise fans for good reason. One of the biggest points of contention was the way the movies handled certain characters or didn't do so at all. Many of the franchise's most beloved Autobots and Decepticons were sidelined for the human characters' sake, or they were adapted terribly.
Source：https://www.cbr.com/transformers-movies-michael-bay-autobot-decepticon-more-screen-time-megatron/
