Do you want more WAAAGH! in New Vegas? Simple really, do you want more fighting, battles, combat, wars etc...?
I know when you look at it at first you may think it wouldn't fit in, but just imagine quests where you were fighting with and agains't 10-20 npc's then more waves keep coming and you must basically wage WAAAGH! on a large scale.
You don't really see anything like that in FO3. I'd have loved for example for a random WAAAGH! with wastelanders and raiders in very large numbers.
WAAAAAAAAAAAAGH!