I think the issue is they are built to be a good transition/possession team. The one thing I noticed last night is they were losing board battles a ton, especially on the PP.
The Rangers are doing to them what teams did to us this season. Make them dump it in and retrieve it and keep them to the outside.
They are generating lots of shots but not a lot of scoring chances.
To be fair, they've lost two OT games and the other teams goalie has been out of his mind...but that's the playoffs. If their power play was even. marginally effective (10% or so), this is at least a 2-1 series.