He has also lead some of the most talented teams in the past 10 years to deep into the second round.
Most talented regular season teams.
They average around 2 goals per playoff game. Actually talented playoff teams rarely are below 3 goals per game. In terms of Cup -winners:
GF/GP:
2017: Penguins - 3.08
2016: Penguins - 3.04 (SJS actually more than that, 3.13)
2015: Blackhawks - 3.00
2014: Kings - 3.38
2017: Capitals - 2.77 in 13 GP. 5th among Playoff teams.
2016: Capitals - 2.42 in 12 GP. 9th among Playoff teams.
2015: Capitals - 2.00 in 14 GP. 2nd worst among Playoff teams.
2014: Capitals - Did not qualify.
Their numbers in terms of goalscoring are nowhere near what they should be for Cup -contenders. Last season they were a bit better (Blackhawks won in 2013 with similar numbers), but those numbers still require that the goaltender stand on their head and that just didn't happen year ago. But it's not like they were scoring goals everywhere and Holtby was bleeding goals against. That was just actually the first time he was actually given any kind of decent support.
Between that period (2015-2017), they have scored 3 goals in a Playoff game 8 out of 19 times. That seems somewhat average number, not actually terrible. That is just their numbers in the 1st rounds though (vs. PHI, NYI, TOR).
In the 2nd rounds they have scored 3 goals in 7 out of the 21 games. Overally that's 15 games out of 40 that they have scored atleast 3 goals. 25 out of 40 where they have scored 0-2 goals. That's awful lot of games that you are expecting your goalie to steal. Good teams don't have to rely on their goaltending nearly that much.