So what's the odds of having 3 DM more than the opponent's attack value?
Because if you do, it's open season, with merely 3% chance to be struck (though if you do, it's probably going to be bad).
if all things are equal, there is a 15% chance of hitting your foe. and a 3% chance of diong critical results (i.e. earning success levels).
but there are options on both sides of things that can adjust