I don't know who the worst would be.

I'm pretty sure Doom is canonically a good leader in Latveria.

considering in a lot of modern media megatron has basically won the war
not him

Negatron

Megatron tries so hard and gets so far but in the end it never matters

You, Me, Best friends.

Bowser is actually a good king. He tries hard to do the best for his people.
Ganon
Lex was just trying to survive
Megatron was trying to help his people.

I love how ganon doesn't get anything in his favor

I retract my statement. Bowser

why?

He murders goombas and koopas

so does Peach

Nuh uh