Keys to victory for Rangers today (if game stands) was the play of Hank and their shot blocking. They were patient on the back end and got a couple lucky bounces and mistakes by Marty to take a 2-0 lead.
However, Rangers are going to be fatigued after the first two rounds and the forecheck and pressure by the Devils isn't helping their cause. This series is far from over. It will likely go to 6 or 7 games.
Rangers have had the clear ref advantage in this game, but the Devs have absolutely nobody to blame but themselves for the scoreboard. They had a million chances. You can't win if you don't finish any.