I guess. But when assessing the PM tenure, I'm more concerned whether the political landscape was good enough to pass good legislation or not, regardless of who proposes/pushes the most for it. Otherwise I'd end up just assigning almost everything good the Liberals did right as an NDP win (which may be fair but it's not useful when discussing PMs).

But I see the Liberals as important articulators the NDP can only negotiate with when the Liberals leadership has the social capital to side with progressives. I think they did a good job managing the average Canadian voter-base for a decade, before the pendulum swing inevitably going back to retrogrades.