if you have 40 HP and i deal you 1d8 damage per round (i'm using the same weapon in both scenarios) i'll kill you in just under 9 rounds. add 2 damage per round to that and now its just over 6 rounds. using a +1d6 instead of the +2 damage, you will die in just 5 rounds.
so you see, the damage we deal is all relative to the monsters we're fighting. two points of damage is always going to be two points of damage, but whether that two points is 2% of your opponent's HP total or 5% of their total (doesn't sound like such a big difference but it is) is going to effect what those two points actually equal.
in NS3 the monsters we fought had lots of HP and lots of resists. the monsters in NS4 don't, and those two points of extra damage you keep talking about go a lot further than we might expect. oh, and nah i passed calc 3 a while ago
