You could not be more wrong. Exar Kun was a cunning Sith Lord. He was very smart. He isn't going to just charge in. He's a very good strategist.
I don't think Exar Kun is going to be 'steam rolling' over anyone. An arrogant, rash, power-hungry Sith Lord is going to charge into the fray without a second thought. Cunning and manipulative Xizor and Traya just have to get out of the way and then shoot him from behind... but we shall see.
And no one is going to shoot Kun from behind. He was incredibly powerful in the Sense family of Force abilities, so his precognitive abilities are quite good.