Conversation so far:
Is The Master (Doctor Who) a very intelligent person?
The Tenth Doctor further expresses admiration for the Master's intellect in The End of Time by calling him "stone cold brilliant.
What makes him brilliant?
Delgado's portrayal of the Master was that of a suave and charming sociopathic individual, able to be polite and murderous at almost the same time.

Question: Was he liked by others?
Self-contained rewrite: Was Delgado liked by others except the Tenth Doctor's admiration?