How on earth did people shoot weddings in the era of film photography? I mean really, you just can't get quality results with a single centrally located split image with micro prism collar. And the RB67 didn't even have that . . .
Seriously though, focus and recompose. It's not that big a deal for a wedding. Your principal subjects during the ceremony are standing still. At the reception they might be dancing, but much of that is slow.
I guess I am getting tired of everyone bashing the camera for it's "limitations" when they should be asking how to improve their technique. And it's not just the D-600 people. I see the same type of comments on the D7000 and D800 forums, etc as well. When did this shift occur where people shut down their minds and turn total control over to the camera?
There are some very accomplished photographers on this site who are willing to share their knowledge. It just seems like a waste to focus so much on what a camera can't do instead of what a photographer CAN do.