The funny thing is, I dont find it a super ability. Either in AI or player hands. Like I said, it's dangerous against low level characters with particularly low dodge scores, but then, so is pretty much everything in the world.
In player hands, I'd never equip a maul weapon unless they had an abnormally high accuracy. Otherwise , they miss most of the time with it in regard to multiple hits. It works out to an occasional extra hit, but most of the time, you miss by your second shot. Any time Ive equipped one, it's been a resounding disappointment. Maul weapons tend to be mid-range damage, from what I've seen. I'd rather just use a high damage weapon and do that extra damage reliably and consistently, then wait for the random extra hit.
I'm not bothered by this ability at all, compared to the other things that bother me in the game. Double-strike or stun every few rounds are far more powerful abilities, IMO.