I think that this is even greater problem than Expertise. Let's see how this look:
http://www.enworld.org/forum/4735419-post1.html
So we can see that our NADs are terribly designed. When PHB2 comes out we see some fixes to this problem. Paragon Defenses gives +1 to all NADs (it's feat bonus). On epic we got Robust Defenses (+2 feat bonus to all NADs) and Epic For/Will/Ref (+4 to single defense).
So if you look at the math crunch it is clear that this feats are the same math fix like Expertise. What's more important I think that they are more problematic than Expertise and more needed.
One of your NADs can be auto-hitet at epic! Your middle hitted on 5-6 on die. Even you best and optimized NAD will be hiteted on 8-9! That's big problem and I wonder why there's no post about that. So you probably will need to take Paragon Defenses (or one or two of this feats: Iron Will, Lighting Reflex, Great Fortitude at paragon. Later on epic you will definitly take Robust Defenses couse this feat is just great. +2 to all NADs is superior. Then you will probably need take one Epic F/R/W feat to you lowest NAD and maybe second for you middle NAD. That will use another 2-3 feats for you character.
I just really hope that WotC will not give us plenty more "must-have" feats, to make the math works, couse this will make the characters so boring and predictable.
http://www.enworld.org/forum/4735419-post1.html
So we can see that our NADs are terribly designed. When PHB2 comes out we see some fixes to this problem. Paragon Defenses gives +1 to all NADs (it's feat bonus). On epic we got Robust Defenses (+2 feat bonus to all NADs) and Epic For/Will/Ref (+4 to single defense).
So if you look at the math crunch it is clear that this feats are the same math fix like Expertise. What's more important I think that they are more problematic than Expertise and more needed.
One of your NADs can be auto-hitet at epic! Your middle hitted on 5-6 on die. Even you best and optimized NAD will be hiteted on 8-9! That's big problem and I wonder why there's no post about that. So you probably will need to take Paragon Defenses (or one or two of this feats: Iron Will, Lighting Reflex, Great Fortitude at paragon. Later on epic you will definitly take Robust Defenses couse this feat is just great. +2 to all NADs is superior. Then you will probably need take one Epic F/R/W feat to you lowest NAD and maybe second for you middle NAD. That will use another 2-3 feats for you character.
I just really hope that WotC will not give us plenty more "must-have" feats, to make the math works, couse this will make the characters so boring and predictable.