Megatron (Michael Bay pentalogy)

Megatron is the main antagonist of the Michael Bay Pentalogy of Transformers, since Transformers 2: Revenge of the Fallen, he was simply just an antagonist as The Fallen for Transformers 2: Revenge of the Fallen, Sentinel Prime for Transformers 3: Dark of the Moon, Lockdown for Transformers 4: Age of Extinction, and Quintessa for Transformers 5: The Last Knight took the role of main antagonist in their respective films.

Why All Decepticons Should Their Backs On Him

 * 1) Megatron's personality consists of being nothing other than an evil, brutal, psychotic, homicidal killing machine.
 * 2) In Transformers 2: Revenge of the Fallen, he and Scalpel tortured Sam Witwicky by attempting to remove his brain for "science".
 * 3) When he became "Galvatron" in Transformers 4: Age of Extinction, he used Transformium just to "transform" from one mode to another.
 * 4) Speaking of his new name "Galvatron", he doesn't stay faithful to that name. In Transformers 5: The Last Knight, he became "Megatron" again.
 * 5) Back to Transformers 2: Revenge of the Fallen, he barely uses his tank mode (which was made for the sole purpose of merchandise).
 * 6) He looks ugly for a Decepticon.
 * 7) He died multiple times and was brought back after nearly every death. This can appear excessive and a poor attempt at keeping Megatron a reoccurring villain.

Redeeming Qualities

 * 1) He was not as bad in Transformers (2007).
 * 2) His design might be ugly, but it had a lot of effort.
 * 3) Hugo Weaving did a great job voicing him.
 * 4) The scene where he orchestrated an attempt to remove the brain of Sam from his skull, mentioned in WHS #2, can be considered cool or appropriately intense since it's disturbing and different.

Trivia

 * 1) In Transformers (2007), he was originally going to be a tank with a G1-esque appearance. The tank actually apears in Megatron's design in Angry birds Transformers.