I've seen several suggestions that JRR was an INTJ. This goes a long way to explaining why I enjoy his stuff so much. I wish more writers could spend their whole lives inventing languages and creating a world before then developing stories within that world. The richness of this completely inefficient process is stunning to me. I wonder how well it is absorbed by you other types.
I am looking for opinions on his writings, not the movies. Movie opinions may be provided secondarily.