Hockey can't be measured. Well, maybe with some AI tools that aren't available to the public. Plus / minus and it's better cousin GF/60 and GA/60 can be very useful if used properly. Problem is very few people know how to use it.
People like points because points are a measure of the individual contribution to goals. The problem is that the average scoring play lasts 10 seconds and there are 6 goals per game so points only measures about 1 minute of a 60 minute game. How do we measure that other 98% of the game? Bedard is on a terrible team so comparing his points across teams would be dumb but a good example why points isn't great.
GF/GA measure the success of a line and not individuals but they are constantly changing. When using GF/GA you need A LOT of data to try and average out the context of different linemates, coaches and competition etc. Traditionally we do something like Marner with Matthews vs Nylander with Matthews over a few years. It's not much better than points but can give you a feel for how effective combinations are especially because it contains a defensive component.
That leads us to the "advanced" stats based on shots and shot attempts which has led to "expected" stats. They look at where every shot was taken from and whether or not it went in over many years and then use it to "value" todays shots. It's probably the best thing we have now as there is TON of data but it seems to confuse a lot of people around here for some reason so I avoid using them for this crowd.
We can only use the tools that we have but when used properly they do seem to do fairly well to confirm the eye test.
Here's an example:last 3 full seasons 5v5:
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We know the context and we've got three years of data. Why is Rantanen a severely negative player when Mack isn't on his line but Mack is fine without him? Now this wouldn't mean much if Rantanen was at the team average of 53 but 42 is absurdly low. Something is very off here. Maybe we could dig deeper by adding more linemates but then we need a lot more data but it sure seems that he needs Mack to be productive but you be your own judge.