When it comes to NADs, I'm adding the same +1/+2/+3 as for to hit. I'm seriously considering doing this without removing any NAD buffing feats at all; simply because it appears it is almost impossible to get a full set of three decent NADs anyhow. Because everyone gets a +3 to all three NADs at Epic, I'm hoping the need to take those NAD buffing feats won't feel as pressing.
They might still want them.
Example. First level PC with random NAD 12 (i.e. 14 stat or human 12 stat or whatever). He never bumps it up (typical and reasonable). He gets +1 ability scores, +3 from you, +15 level, and +6 magic. He got hit on a 9 at level 1, he gets hit on a 5 at level 30. When same level Epic monsters are hitting that NAD and putting conditions on the PC 75% and even 80% of the time (or higher level monsters are doing it 90% or 95% of the time), it will start getting old. Or, at least it would for me as a player.
Granted, it will not be every encounter, just some of them.