I'm not sure interestingness is really the focus of the issue. I'm sure feminist post-structuralist discourse analyses of the recent banking crisis are very interesting to people interested in the subject, but I still don't think it has any power to deduce true facts about the universe.

I do have another heuristic which is a little less straightforward to apply, but a little more selective: would a society of humans kept isolated from our own for thousands of years develop a similar discipline with the same essential elements as our version? Pure maths definitely passes that one, while something like Jungian analysis probably wouldn't.