It's not that the Campy NR RD shifted badly. It's that the Slant-pantograph design shifts better. There is a reason why, once the Suntour patent on that design expired in 1984, everybody - including Campy, eventually - adopted that design.
Having said that, I still think the NR is the prettiest RD made. That pebble-grain body, the lines, the finish - visual perfection.
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"I'm in shape -- round is a shape." Andy Rooney