Down-to-earth, friendly, confident, caring, hot, plucky tomboy goes a long way in any situation.
I think it's the fact that she is, or was, basically a civilian (aside from the survival tips Chris gave her) in a franchise full of soldiers, agents and spies that endears her to players.
I don't agree, even in situations where a game won't suffer a visual tradeoff due to having already been created for a lower-spec console, as in this case.
Aesthetically, it can certainly make a difference. For the reasons people found MGSV's shaky cam cutscenes disorienting in 60fps, or thought The Hobbit's interiors looked fake and studio-like in 48fps, there's something to be said for the way the brain processes non-existent frames. I think it suits horror more enormously, for one.
As for gameplay, you really need to design gameplay around 60fps, ie by implementing single frame actions or extremely quick enemy actions, for it to make a difference. Since Revelations 2 has no doubt been designed around 30, I think it won't really matter which platform I buy it on. And it'll look more consistent with the series if I play in 30, which I probably will.