[throwaway81523]

If you are looking for such things, I thought that "The Shadow of Angmar" by Steelbadger does a mostly-good job of telling a story in a Tolkien-like style. It's a LOTR/Harry Potter crossover fanfic that is well regarded in its little niche. Unfortunately, it's not finished. The author says he hasn't given up on it, but there haven't been any updates in a while. There is enough to be quite a good read though. I would say it was/is intended to have three main arcs. The first two arcs are completed and online. I can imagine what was intended for the third, and it seems very difficult to do, which might explain why the author hasn't yet attempted it.