With Ra, the Afro-futurist project is interesting, as is creating an environment/language that white people cannot easily co-opt. I get that, and find it important. In addition a lot of the music is good, and the visual aspects of the album covers, chap-books, and surrounding objects are neat. That is something to talk about in a broad overview context.
I'm not so into a lot of the sci-fi kitsch myself, however, and the theater I can take or leave -- sometimes it is cool to see, sometimes not for me. The latter aspects to me are extra-musical baggage and get a bit cloying. What I find a bit frustrating also (and this has been my general experience) is that people get very into the idea of this outer-space cat, but leave aside the music, and don't have much interest in the broader continuum. That isn't the fault of Sun Ra, though.