A strange sort of problem I have with TOR in general and especially with the material from Heart of the Wild and Darkening of Mirkwood is that they're "too good". As a GM I almost dont want to run them since I'm afraid that many of my players can't handle the themes and moods that the game so excellently focuses on.
The One Ring, in my opinion, is a game for players who really likes the books and films, and cares about the setting. This isn't "kill the orcs and loot their treasure D&D-style".
Again, excellent book. Hopefully this will keep us happy for a while before we start asking for the Rivendell book.
-Eirik