I'm on both sides of this
First off, the goalie is a part of the team. I always hate it when other teams fans complain when we win a game that we probably shouldn't have because of helle. My take is rhat the goalie is a huge part of the team, and building around a great one is a way of building a roster that can win. Nobody ever says "well, Edmonton wouldn't have beaten us if it weren't for their centres".
We couldn't match up with Colorado's great forwards or their D. Our depth and pur goaltending needed to come through for our roster, as it's constructed, to beat the Avs.
The difference between helle's .870 in that series and his .920 over the regular season is 10 goals over those 5 games. It would have been enough to win us a couple of games
So TL/DR version... if we're gonna credit Helle for stealing us games when his performance warrants it, we can't let him off the hook when his performance costs us games as well