I think the Isles and Tampa Bay disagree. Montreal too this year, maybe. Although I agree Pittsburgh can't get it done against the Rangers.
Montreal doesn't have the depth the Rangers have, not even close. Tampa is tough to judge. They beat the Rangers all 3 times they played this year, pretty handily, too. On the otherhand, They played 3 times in 3 weeks (or something like that) when Tampa was playing the best they played all year and when the Rangers were playing the worst they played all year. But, I think it will be Detroit or Boston coming out of that division (assuming no cross-over of the wild-card teams).
With Pittsburgh, it is just strange. For a long time, it didn't matter how well Lundqvist was playing headed into the game, Malkin and Crosby just knew how to score on him. Never figured out why. Maybe they were picking up something he was doing that let them know where he was most vulnerable at the time, similar to how a pitcher will sometimes tip his pitches. Lately though, just hasn't been the case.