1992-03, AINEC.
Lemieux was a head above just about everyone in the league that season. 27 years old at his prime, and in spite of the non-Hodgkin's lymphoma, never missed a beat, and led the Pens to an NHL record 17 game winning streak to end the season with the Presidents Trophy.
1988-89 Lemieux was impressive, but the problem is that he started off on all cylinders, and levelled off a bit towards the end of the season, preventing him from ever reaching the 200 point mark. Pittsburgh made the playoffs for the first time since 1982, but he did not really shift gears in the playoffs, and were upset by the Flyers.
1995-96 Lemieux had an MVP season, but he was not the dominant player he was in 1992-03. Perhaps it would have been different if he had dominated and led the Pens to a Stanley Cup, but he was hampered by Florida's neural zone trap, and all the clutching and grabbing.