Hawks are worse than us defensively.
We weren't that bad defensively, Hawks were actually legit terrible defensively. Penguins were nowhere near as bad as people want to make it out to be.
Teams that were worse than us defensively?
Winnipeg Jets
Colorado Avalanche
Washington Capitals
Vancouver Canucks
Anaheim Ducks
Toronto Maple Leafs
San Jose Sharks
Los Angeles Kings
New York Rangers
Buffalo Sabres
Edmonton Oilers
New Jersey Devils
Detroit Red Wings
Florida Panthers
Philadelphia Flyers
Chicago Blackhawks
Ottawa Senators
Penguins were 14th best defensively. Bold are the teams that made the playoffs. As a fun fact - Pens allowed 18 more goals against than the Blues, but also were 6th offensively. You know why we suck? Because when it came to crunch time, the team and the staff shat the bed, just a big giant juicy dump.
Under Bylsma/Johnston the Pens were a top 10 PK team, but with Sullivan, the Pens have been routinely in the bottom 10 defensively, what changed is the insane lack of support by the forwards on defense, in 2015/16 the pens were still fairly good defensively, but it could have been a mix of Bylsma/MJ and then Sullivan tweaking things, but after that the more in place Sullivan's system got, the PK just got worse and worse. Martin was also a part of some of those good, very good PK's...so what changed? We've had worse defense than this with better results.
But people have their narratives, actual facts don't seem to matter anymore. Good teams find a way to adapt and evolve, Pens won 2 cups in a row, got cocky, then leaned hard on excuses.