Using the table breaking down even strength, powerplay, and shorthanded goals
here, I adjusted every season of Gretzky, Lemieux, and Orr (except Orr's rookie season due to lack of data) to 2014-15 levels of scoring (4.05 EV, 1.14 PP, and 0.14 SH goals per game). The usual caveats to raw adjusting of stats apply, although I hope that this is closer than just using plain total goals per game for the adjusting ratios.
Gretzky:
Original|Adjusted|Adjusted|Adjusted|Adjusted|Adjusted
Player Season|Games|Goals|Assists|Points|Points/Game
1979-80|81|40|71|111|1.37
1980-81|82|38|81|119|1.45
1981-82|82|
63
|84|147|1.79
1982-83|82|50|93|143|1.74
1983-84|76|59|85|144|
1.89
1984-85|82|50|98|148|1.80
1985-86|82|36|
115
|
151
|1.84
1986-87|81|45|93|138|1.70
1987-88|66|29|82|111|1.68
1988-89|80|39|82|121|1.51
1989-90|75|29|78|107|1.43
1990-91|80|33|98|131|1.64
1991-92|76|23|69|92|1.21
1992-93|44|12|33|45|1.02
1993-94|79|29|71|100|1.27
1994-95|82|17|54|71|0.87
1995-96|80|20|65|85|1.06
1996-97|82|23|69|92|1.12
1997-98|82|24|70|94|1.15
1998-99|70|9|52|61|0.87
Total
|
1544
|
668
|
1543
|
2211
|
1.43
Lemieux:
Original|Adjusted|Adjusted|Adjusted|Adjusted|Adjusted
Player Season|Games|Goals|Assists|Points|Points/Game
1984-85|75|30|41|71|0.95
1985-86|81|33|64|97|1.20
1986-87|65|40|41|81|1.25
1987-88|79|48|66|114|1.44
1988-89|78|
57
|
81
|
138
|1.77
1989-90|60|33|57|90|1.50
1990-91|27|15|22|37|1.37
1991-92|66|34|67|101|1.53
1992-93|59|50|64|114|
1.93
1993-94|21|13|16|29|1.38
1995-96|70|53|75|128|1.83
1996-97|76|45|69|114|1.50
2000-01|43|32|39|71|1.65
2001-02|24|6|25|31|1.29
2002-03|67|26|61|87|1.30
2003-04|10|1|8|9|0.90
2005-06|26|6|10|16|0.62
Total
|
927
|
522
|
806
|
1328
|
1.43
Orr (minus his rookie season):
Original|Adjusted|Adjusted|Adjusted|Adjusted|Adjusted
Player Season|Games|Goals|Assists|Points|Points/Game
1967-68|51|11|23|34|0.67
1968-69|72|20|44|64|0.89
1969-70|82|33|89|122|1.49
1970-71|82|32|
94
|
126
|
1.54
1971-72|80|33|78|111|1.39
1972-73|66|25|67|92|1.39
1973-74|78|28|84|112|1.44
1974-75|82|
36
|74|110|1.34
1975-76|10|4|10|14|1.40
1976-77|21|4|18|22|1.05
1978-79|6|2|2|4|0.67
Partial Total
|
630
|
228
|
583
|
811
|
1.29
Notes:
-Gretzky has five 140+ point "fine-tuned" adjusted seasons, and his 1985-86 season would translate to 151 points today (well, 2014-15).
-Gretzky's most dominant Art Ross-winning season (1986-87) is not his best season here. Honestly, this feels like it passes the "smell test".
-Gretzky would have won the Art Ross last season with 16 of his 20 seasons. He also has 5 seasons where his translated assists would have been Art Ross wins in 2014-15.
-Lemieux owns the best single season points-per-game after the "fine-tuned" adjustments. Yes, it is 1992-93, where it would have translated to 1.93 points per game in 2014-15. Gretzky follows closely with his 1983-84 season (1.89 translated points per game).
-Injuries would still hinder Lemieux's career if all of his career were played in the current era. He never quite cracks 140 points, peaking at 138 translated points in 1988-89.
-Lemieux has 8 seasons that would have translated to Art Ross wins last season. None of his translated assist totals would have won an Art Ross, though, since he's one of those...
people who prefers to score goals.
-Holy crap, Bobby Orr! He's a defenseman who has 5 seasons translating to 110+ points in 2014-15 and 2 seasons translating to 120+ points.
-Orr would have 6 seasons that would have translated to Art Ross wins in 2014-15. He also has 2 seasons where his translated assists would have been Art Ross wins in 2014-15.
-No, Erik Karlsson is not the modern-day equivalent of Bobby Orr, whoever-posted-that-on-the-main-boards.
-Both Gretzky and Lemieux would have translated career 1.43 points per game (a
career average of a 117-point pace per 82 games in 2014-15).
SUMMARY:
Even after adjusting scoring to super-dismal 2014-15 levels, Gretzky, Lemieux, and Orr turn out to be unfathomably* better than anyone else who is currently playing in the NHL.
*Although, I'm assuming that's why they're three of the Big Four.