Its an unwinnable argument, much like Fantasy=dragons/tinycostumes/big swords. Good fantasy is like good SF but people who don't watch/read a lot of it are never going to understand that. Hence it has its own section in the book/dvd store to protect the normals. And why great shows/movies/writers get dismissed as 'just SF' or 'just fantasy'. It a statement gets more people to watch a good show then let it be.

I have yet to see the new version of BSG, could never stand the old version, I think ST:TOS has fulfilled my quota of shonky old sci-fi.