Centering is a nice bonus but not a necessity. I prefer sharp corners over centering as off-centering is a "natural" defect and hence is more acceptable to me...I must say I've started to pay attention to it/appreciate centering more in recent months...example:
On the other hand, I am perfectly happy with my Clemente RC, would rather have this one with sharp-ish corners than a centered one with soft corners:
To each his own, I guess--helps to be flexible on this issue in terms of price.