Thoughts on Sons of Famous Authors Continuing their Father's Works

Once again we are faced with this situation - the son of a great author has written a book based in his father's literary world and based on his father's 'outline' or 'notes' or 'rough draft.' We have seen this before in the Dune works of Brian Herbert and now we must face the book written by the son of J.R.R. Tolkien - "The Children of Hurin" by Christopher Tolkien.

Like Brian Herbert, Christopher Tolkien claims that the work is not completely his own but mostly his fathers. In the case of the Dune books a reader could tell a real difference - how great will the difference be in "Hurin"?

I have decided to re-read the "Silmarilion" first and then read "Children of Hurin." I am doing this because I haven't read the "Silmarilion" in 10-15 years and because I know that "Hurin" relates to events of roughly the same time period.

What do you think? Should sons be allowed to continue their fathers' works? Or are they merely collecting a fast dollar while standing on the shoulders of giants?