Well, IMO Exar Kun is rather brutish and uncoordinated.
He is very confrontational, though I won't call him brutish. He often sneaks in to confront the enemy leader directly, instead of planning great strategies.
He did however create a plot that killed lots of Jedi masters and krippled the Order. And thatone was coordinated.
When fighting Sion, Exar Kun will simply erode Sion's will until he dies. IIRC he did the same thing with Odan-Urr. (Not simply talking, but basically Force-pursueding him to die.)