It goes beyond just that Game 5 gaffe in double overtime.
Tristan Jarry had the worst statistical performance in the playoffs of any goaltender in the league since 2014.
The best advanced metric to measure a goaltender's success is GSAx: Goals saved above expected. It does what the traditional goaltending metrics -- goals-against average and save percentage -- can't do, which is take into account the quality of play by the goaltender's teammates in front of him.
GSAx uses the stat xG (expected goals), which assigns a value to every shot attempt based on its location, shot type, and other factors based on the probability of that shot going in. If a team is taking a lot of high-danger shots, that's reflected in this stat. The end result is a figure of how many goals a team is expected to score over 60 minutes.
GSAx takes the xG and subtracts the actual goals allowed by the goaltender. If the result is a positive number, then the goaltender allowed fewer goals than expected given the quantity and quality of shots he faced. If the result is a negative number, he was underperforming and allowed more goals than he should have based on the workload.
Jarry finished with a GSAx of -7.92, meaning he allowed about eight more goals than he should have in this series. Per the advanced stats site MoneyPuck, that's the worst result of any goaltender in the postseason since 2014, when Ilya Bryzgalov saved -8.3 goals above expected for the Wild.
Even if you account for any defensive lapses in front of him, Jarry was still significantly underperforming.
That was especially evident in Game 6. The number of expected goals in the game for the Islanders based on the quantity quality of shots they were getting was just 1.58. Of course, they scored a few more than that, eliminating the Penguins with a 5-3 win.
Looking at the underlying numbers behind Jarry's performance these playoffs, it's clear that rebound control was a factor. Jarry created rebound opportunities at a higher rate than any other goaltender in these playoffs, allowing .075 rebounds for every save he'd make.
MORE NUMBERS FROM THE SERIES
• At five-on-five, the Penguins did a better job of controlling the shot attempts, accounting for 58.92 percent of all attempts taken in this series.
• The Islanders' combined shooting percentage at five-on-five was 10.98 percent. The Penguins' was nearly half, at 5.77 percent.
• Jake Guentzel didn't get a goal until the final game, but he led the Penguins in shots in the series with 25. He also led in high-danger attempts, with 11.
• Guentzel drew five penalties in the series. Nobody else drew more than two.
• Brandon Tanev had the most hits, with 39. Kris Letang was next with 30.
• Brian Dumoulin led the team with 10 blocked shots. Letang was next with eight.
• Kasperi Kapanen had five takeaways, the most on the team.
• Jeff Carter was the only Penguins center to finish with a faceoff percentage above 50 percent, winning 57.28 percent of his draws. Teddy Blueger won 44.64 percent, Evgeni Malkin was next with 44.12 percent, and Sidney Crosby was last with 42.19 percent. The Penguins' combined faceoff percentage of 47.5 currently ranks 12th among the 16 playoff teams.
• The Penguins' shorthanded faceoff percentage was good, at 55.2 percent, the third best among playoff teams. Their power play faceoff percentage was 42.9 percent, the second-worst.
• As of the time the Penguins were eliminated, their power play ranked sixth among all teams in the postseason with a 25 percent success rate. The penalty kill ranked seventh at 81.3 percent.
• The Penguins had the second-most first period goals of any playoff team as of Wednesday night, with seven. The Islanders were held to four.
• The Penguins currently lead the playoffs in total shots taken, with 231.
