I honestly don't care what Marvel Legends did with their articulation. I didn't collect them; I thought they were over-articulated, to be honest.
With DCUC, my preference is that the articulation remain consistent throughout the line, or as consistent as possible since this change is apparently already imminent. Part of the reason DCUC appeals to me is that the lines of the figures are so clean - adding more articulation will tend to break that 'clean' look. Just seeing the images of the Blue Beetle from ToyFair, the double joint was glaringly out of place, IMO.