We all have those games. We love them ever so much, and could spend hours talking about them. But the thing about talking is that it generally requires another person to be talked to. And sadly, this is about those games were there is no other person. You ask everyone you know, but you just can't find anyone with the same passion for it that you have.
For me it would be the entire Total War series. I have one friend that's only into Empire, but he hasn't much to say about it, and he's never around either way, so I never get to talk to him about it much anyway. The rest have either never played them, or just have no interest in them.
sigh...