It is proven that they can beat good teams, if they somehow make it to the playoffs they have a chance against any team out there. A young inexperienced team will have its ups and downs but the talent is definitely there.
It is not proven that we can beat a good team on the road. The only team we beat on the road all year is arguably the worst team in football and we won by 2 points (needing a late 4th quarter game-winning drive to do it). At home, we seem to be able to spring some upsets. However, I can't imagine any playoff scenario where we would not be double digit road underdogs.