Goalies are paid to prevent goals when mistakes happens, at a certain rate. Our goaltenders have not been making those saves at that rate, so you can point to individual mistakes all you like, but it's goaltending most letting us down. The team is average defensively.
More accurately, we have been bad defensively for so long that people nitpick and exaggerate every mistake or chance against, and they think we're worse than everybody else and always will be, even though we've been much better this year.
Problem is, when our team is in the opponent's zone, we naturally focus in on our players and the offensive ability they show, instead of the exact same mistakes from every other player on every other team.