Fatal Frame/Project Zero/Whatever you call it.
In North America, at least. Between Fatal Frame IV not getting an export at all, the wiimake of 2 not coming to America, and the 3DS spinoff that came and went in the blink of an eye, the series is basically dead in my region. Now if only we can get either an HD collection or a new game on next gen consoles (all of them, not just WiiU), then it might pick up steam again. That's only likely to happen if Tecmo drops its Wii/Nintendo obsession, though. At least the original three are on PSN, now.
In 2-3 years I've no doubt I'll be saying much the same thing about Silent Hill, since Konami's horrible marketing basically killed whatever chances Downpour had of succeeding. (Shut up, I liked that game).