UngeheuerLich said:
and besides: +3 at LVL 6 to hit can make the difference between no damage and full damage +3 (the damage boost is only aditional damage, the to hit bonus is more important)
It still doesn't stack with bless, heroes feast, righteous wrath of the faithful, and probably a couple others I'm not thinking of. It might not even be +3.
UngeheuerLich said:
just make a list where you missed by 3 points (don´t forget confirm crits and especially 2nd and 3rd attack) and count it up...
I'm going to go out on a limb here and say that it happens less than 15% of the time.
Here is a list of the times that the +3 has no effect at all:
-rolled a 1
-would hit on a 2 regardless of whether you have the +3 or not
-would miss on a 19 regardless of the +3
-rolled a 20 and roll a 20 or 1 on the confirmation roll
-don't make an attack roll or you attack with a non-weapon
It also adds a 15% to hit if you only hit on a 17 or less WITH the bonus. If you hit on a 18+ without the bonus, then essentially it is only adding +2, if you hit on a 19+ then it is only adding +1. Which, strangely makes it weaker against really hard to hit things(or with your 3rd attack).
I don't have the math skills to figure out how many of your rolls your song will effect given those exceptions. However, I can tell you that it has to be less than 15% of the time. And if we can assume that 10% of the rolls are natural 20s and natural 1s, it probably has an effect less than 5% of the time. Plus, it likely isn't affecting the wizard or cleric a large portion of the time.
When your prime ability is nearly useless over 80% of the time, it doesn't count as a prime ability anymore.