The pens are winning because they fundamentally changed the system they are playing, made more favorable lines and pairings, and because they benched dead weight. They did so after having a subpar team push them almost to a game 7 in the first round and avoiding the two worse low round matchups they could have faced. This is about what happened last year...
If the pens continue to play smart hockey with the lead... not passive or overaggressive crud hockey they played almost all year, they may have a shot at beating a better team than they are... and lets not kid ourselves, Boston and pretty much the whole west are better teams overall than the pens have been this season, even if some have less actual talent.
The pens have had a run of good luck this playoffs, and combined with some hard play of late have looked Good to Ok the last 3 games. Lets not lose sight that they barely got out of the first round and looked terrible doing so. They almost blew a 4 goal lead in game 6... playing the kind of hockey that saw them have a sub 500 record from February through the early part of the playoffs.
If people saw that and banked on them getting to the finals, well that's probably just blind faith or random wishing cause frankly there was little to look at down the stretch and feel good about. They changed a ton of fundamental flaws that have been pointed out over and over out not just by posters here, but media guys all around hockey who were all seeing the same piss poor lazy stupid hockey that the Pens were playing down the stretch and through the first round...
Its nice to see them add speed to the 4th line, to drop the redundant Glass from the active roster, to play without a lesser version of Orpik, and to get away from lines that don't really work at a high level in the playoffs. Its even better to see them address the cross ice flaw in their power play that has been hanging there for some time and to utilize all three forwards in the defensive zone.
go rewatch last game... there were at least three occasions we had the puck pinned in our own zone for well over a minute and if The rangers weren't a worn out team struggling to find the net, probably give up several more goals in that game. That last game wouldn't cut it vs Boston or Chicago, and that was one of the better games they have played all season...
They still have serious flaws, possibly from trying to change what they fundamentally are doing in the middle of the playoffs, since we were too stupid to install a real playoff system late in the regular season when the games were meaningless and we were getting beat anyhow...
Is it nice that they are trying to play the way we'd like for a bit, sure, but to ignore that the offense still isn't exactly perfect for playoff 5 on 5 situation and the defense is still a work in progress is just obtuse...