It's just that saying it runs fine on X doesn't really say anything in most cases, some extra info is needed so other people can make a judgement on if they think that's good or not.
I would assume the resolution scaling slider is down at 50% or something, because I just can't see that card getting 45-60 unless you spend all your time at the beach.
I would be interested to see a fraps benchmark with frametimes of like 10 minutes of gameplay, because I very much doubt you can actually maintain 45-60 with that card in forests and stuff. Most people are bad at judging framerates by eye, saw so many people say they were getting close to 60fps in this shortly after launch. But when I asked if they could provide some data to prove that, it turned out they were closer to 30.
So I never really trust anyone that says a game runs "fine" or "feels like 60fps" if they can't back it up with some proof, because in most cases that isn't really true. Those people should be glad they can tolerate subpar framerates, but it doesn't help others who think 30fps is unplayable.