I'm glad this thread got rezzed as it allows me to post something important I realised only when re-reading it.
I like Sci-Fi media that borrows heavily from Fantasy. I like Warhammer 40k, I like Star Wars. I like Space Elves and Mysterious Old Psychics.
I like media that mixes the two, or at least I think I do, because I struggle to name many that fit this.
What leaves me lukewarm on a frequent basis are Fantasy books that reveal they were actually Sci-Fis all along. Aka damn you Anne McCaffrey. In fairness, this might be influenced by that series going downhill at the same time she introduced the Sci-Fi anyway.
Also I cheered loudly at Teresa's bracketed comments on fantasy. There's a thread to be had there, which I might start (or look to see if there's an ongoing one) when I've stopped running around.