I'll admit there was/is a possibility of them hooking up, but I certainly never wanted it to happen. It was actually one of my worst fears in the Slayerverse. And if they did get together, I definitely think it would be Angelus, not Angel. Even though Angel and Faith have a lot in common, that doesn't necessarily mean it's better. After all, if you're trying to escape and come to terms with your dark past, you don't want to mope around with another murderous being. When I picture them together, all I see is sex, sex, sex, and a lot of angst. Nothing that constitutes as a healthy, caring relationship. All the brooding would only drag both of them down further.
But honestly, don't pay attention to me, because I'm a hard-core Buffy/Angel fan. Believe me, if Buffy had never been in the picture, I might revel in the possibility of Angel/Faith. However, that's not how the story went. I'd rather see Faith get killed off then live "happily" ever after with Angel.