[Eönwë]

Well personally, I love the Unfinished Tales, because they tell you all the stuff you alwyays wanted to know, except the really mysterious stuff (like Tom Bombadil).

And the Numenor bits show that however adavanced you are you still have problems. And that you can still be turned evil (with the right persuasion, or if you happen to have an evil demi-god you captured in prison and then make him your advisor).
The only criticism I can give about the Numenor parts is that though don't show enough of Valandil (The first of the faithful). He is more important (really) than many of the kings.