Well, I'm not saying that they should exaggerate on it, but a bit more, especially in those areas where you have large spaces filled with nothing they could add some more stuff.
Hostile mob density is okay, yes. But they could add small, non-hostile level 1 critters somewhere inbetween, which only have 1HP and their name only pops up, when you deliberately target them.
Also, I know that it's a dying world plagued by sin eaters for 100 years. However, what bothers me is, that I don't see any of these sin eaters at all roaming the area, outside of the MSQ.
Lol, I have the exactly opposite feeling. The fact that there are not so many people all over the place is what is annoying in my opinion. I'm playin a MMORPG after all and not a co-op single player title.