One certainly can’t argue the ambitions of Starscream, even though his loyalty constantly comes into question. Starscream is the prototypical Decepticon, cunning and evil, comsumed with power, and driven to destroy the Autobots.
It’s a wonder why Megatron never got rid of Starcream considering their disputes only helped the Autobots defeat the Decepticons attempt at world domination. Why take the chance? Why keep him around? Perhaps Megatron embodies some of the Autobot characteristics of brotherhood and loyalty.
Starscream was the coolest looking of the fighter plane Decepticons.