As far as I know, one of the things Tolkien created was what I call the "long slog" genre of fantasy, which involves the hero(es) traveling great distances, often getting the story bogged down in their travels (yeah, I know it's been done before).
I did manage to finish the trilogy, mostly because I had little better to read that I hadn't or wouldn't, back in those days in my small city prior to the Internet, but I see more than a little commonality between the two authors, except Tolkien had a lot more respect for his audience, i.e. was willing to take the extra effort to keep it focused and on track.
(And compare to Robert Jordan, who just stopped the plot for long enough I gave up on the series, life's just too short for it. I also didn't pick up an early and important, extremely plot significant clue about the taint.)