From my personal perspective, a slightly rotated reverse on a modern coin is a detractor to the coin itself. Obviously, a rotation of a high degree would be attractive but only as an error and not a date example of a coin. Rotated reverses on older coins tended to be more common so I am not quite so picky about them. If I had to choose between a Franklin with slight rotation and a Franklin with perfect alignment, I would pick the one with a perfect alignment every time.