I actually tried really hard to get into it because of the female assassins and yuri factor. But I just couldn't finish it because it was boring and felt very empty, like style over substance. If they were men, I would still feel the same. Sorry. Not all yaoi fans will indiscriminately ship every pairing.
Also, in my experience, even with yaoi fandom, if something is very boring the popularity and activity of the fandom will only last so long.