Forostar
Ancient Mariner
Life is not one big fairytale either.I don't see the point in reading The Children of Hurin. The story has already been told in The Silmarillion and it's pretty damn bleak and depressing.
Edit: I agree that it is doomy story but the Silmarillion account leaves out the greater part of the tale. According to the Tolkien Estate ".. approximately 75% of the actual story appears in interrupted form in Unfinished Tales. Also, a brief version of the tale can be found in The Silmarillion and there are variations of parts of the story and references to it throughout the History of Middle-earth series, and most notably in vols. II, III, IV, V, and XI."
Some more from the Tolkien State (more here: http://www.tolkienestate.com/faq/ )
Is there any point reading this book if I've already read Unfinished Tales / The Lays of Beleriand / etc. ?
This would have to be up to you. If you have read any or all of the above works, there may be little to surprise you in the actual storyline. You will however be reading a stand-alone version of the tale, constructed with the reader's pleasure in mind, rather than to give a precise and analytical explanation of how the story evolved, which is the approach adopted by The History of Middle-earth. As such, you may find that the flow of the story brings new pleasure and insight to your reading.
What is the importance of the tale of the children of Húrin in JRR Tolkien's writings ?
The tale was of great personal importance to the author, and probably one of the main springboards for his entire Legendarium. He worked at the tale all through his life, returning to it again and again, and it was a source of great frustration to him that he never managed to complete it.
It is a story of Middle-earth in an altogether different literary mode than The Lord of the Rings, taking place in a different time. But it also stands out from other tales of the First Age in its much greater elaboration, and in its study of character. We believe it to be a work of great emotional power and tragic interest in its own right.