I am moving towards being a centering snob but do still have quite a few o/c cards before I started appreciating this aspect. But the third spoke nobody has mentioned is pack-freshness/color/image, etc which transcends both centering and corners. For example, I think this Maris is better looking than a centered one that is faded and/or banged corner, some of which could get a 5.5. My Maris:
