I think Hammerhead is brutal on it's own on Zigurat scenarios. He doesn't really have to do a lot other than going for last and use his action to displace an enemy on the zone and place himself in the enemy place. 1 less point for the enemy +1 for you.
Easy to counter by state remove cards or just Maximus' Adamantine which results most often in Hammerhead's death if he doesn't get switches to remove the Poison tokens or his tactic etc. So Hammerhead needs 'softer' targets. But he is a great displacer and scorer. I love the character.