This post is a great example of numbers needing context.
Your Mahovlich comparison makes no sense, for any number of reasons:
- Offense obviously took a significant jump after expansion. Mahovlich played his Toronto seasons during the Original Six era, and arrived in Montreal in 1971. You'll notice that his placements in goals and points were higher in Toronto than in Detroit or Montreal.
- He played on great Toronto teams, and won four of his 6 Stanley Cups there.
- Imlach's Leafs of the 1960's were perhaps the most defensive-minded teams of all time.
- The playoffs were 50% longer after expansion. Obviously his point totals will skyrocket playing 20 games instead of 12.
Moving on to the other two:
Dionne's playoff PPG is lower than the other two, despite his regular-season PPG obviously being quite a bit higher, particularly in his prime.
Cam Neely had one offensive no-show in the playoffs, as a 20 year old coming off a 35 point regular season. Cam Neely also has one of the best playoff goals-per-game averages in history, and was an absolutely dominant playoff performer his entire career in Boston. As soon as Cam Neely became a star in the regular season, his playoff performances followed (and then some!)
Dale Hawerchuk did exactly what you'd expect a star player on poor teams to do: play like a star player. Sure, the Jets were going nowhere. But Hawerchuk was a point-per-game or higher in 7 of his 8 seasons there, and only missed the 8th season by 1 point. Keep in mind that Hawerchuk's teams made it past the first round less often than Dionne's Kings, and that Dionne averaged 10-15 points more per season in LA than Hawerchuk did in Winnipeg.
From 1978-1981 Marcel Dionne was the NHL's leading scorer, and trailed only Mike Bossy in goals. In those four consecutive playoff years, he amassed 1 goal and 7 assists in 12 games. Nobody should have expected him to lead the playoffs on a bad team. But a guy who averages 55 goals and 130 points a year should score at more than a 46 point pace. He was perhaps the best offensive player in the game outside of Gretzky, and he had maybe 2 or 3 playoffs where he played at that level.
And that is why Marcel Dionne gets ragged on for his playoff performances.