I'm torn on this one. Some of my favorite LOTR content is the appendices in the ROTK paperback and Unfinished Tales. I know large amounts of the plot in this will be made up fan fiction.
The world building will likely be the only needlemover for a super fan such as myself. Super fan in the sense of textual content of LOTR, not of all the on screen properties.
In all likelihood the world building as a good chance of being bad ass…
Compared to the garbage filler injected into the Star Wars universe, at least this movie is rooted somewhat in canon.