Re-watched both The Force Among Us and Ringers: Lord of the Fans, I find that I usually rather enjoy these types of films, I'm not sure what it is I find so appealing, perhaps it's just that they feature like-minded people talking about the things they enjoy.
I guess you'd have to a be fan of Lord of the Rings and Star Wars to enjoy either of these documentaries and if you have more than a passing interest in either franchise these may well be of interest to you and I'm sure if you shopped around they could be found fairly cheap.