I used to utilise something similar, very frequently. I was a Knight on a medieval RP server. Everyone loved RPing with swords etc, and I was the only one that used hammers and maces. Logically and realistically it can take a lot of cutting before a sword penetrates steel plating, probably 2-4 thrusts before it does too, and that requires attempting to puncture the same spot. So I used a mace or hammer, a good swing into my opponents center mass and they were down and out of the fight in a single hit. To say the least, not many knights lasted long whilst fighting Sir Lefricus.
TL;DR
Blunt force works amazingly against armoured opponents. It can break/crush/shatter bones and squash organs.