The cast is maybe too small. That's my only negative critique of it.
I actually think he filled out the Decepticon high command perfectly.
The Tyrant (Megatron)
The Treacherously Ambitious (Starscream)
The Black Hat (Soundwave)
The Amoral Scientist (Shockwave).
And yes, you could claim Starscream was also an amoral scientist but that facet of his character has never been emphasized.