Well, I guess you could say that. He's not really the best example of a Sith Lord.
But this reminds me of what several characters say when they compare Revan and Malak to Exar Kun. They were right, that's for sure.
Exar Kun is full of ambition, killed and surpassed both Nadd and Baas. He played a much better antagonist role than Malak.