Read the book last summer when it came out. Hadn't found this wonderful intoxicant we call The Chrons at that point, so can only offer my thoughts after the read.
I didn't read much of the reviews, and so was dreading another CT effort where JRR's writing gets lost in CT's editing. Was very pleased to find no such thing; the book was the Silmarillion's story of Hurin and family, only brought to life and given wings (an odd thing to say about Morgoth's Curse, indeed). It's true that it's dark; it is Tolkien's tragedy, and I remember the Nirnaeth Arnoediad chapter in The Silmarillion evoking that same bleak feeling and continuing it all the way thru Turin's life and right up to Tuor, too (BTW, Interesting that CT chose to keep that small piece where Tuor spies the Mormegil but says nothing; almost like it's important to connect the two cousins by physical proximity for one brief moment). All in all, a good read for any Tolkien fan. I can see, though, where someone who's not read the Silmarillion could get a little lost, as the reader cannot get the same background on Doriath, the other houses of men, or really why Gondolin and Nargothrond were important but doomed nevertheless from this book.
Still, well worth the read, well worth owning, and well worth discussing!