I have never understood "+/- is worthless"? Ofcourse its a worthy stat - it means when the player is on the ice 5vs5 his team score more than let in. How is that worthless?
It’s not worthless, but it’s not a great measure of a player’s relative usefulness in terms of scoring and/or preventing goals without context: how a player is utilized on the team, quality of teammates, his match ups, and so on.
It gets super frustrating sometimes when people look at the +/- to draw conclusions: “hey why do we keep playing this defenseman 25 minutes a night when this other guy is playing 17 minutes with a superior +/-?“. Did you realize that the “minus” player is routinely matched up against the other teams’ top lines for defensive zone draws, usually with a low scoring checking line taking the faceoffs, and wondered what that will do for his +/- in the long run? If you’re always out defending McDrai, you’ll have a tougher time maintaining a positive +/- than if you’re matched up against RNH.
Here’s another example I saw in a thread more recently: Peter Forsberg was a great player, and he didn’t have a minus season before the comeback attempt in 2011. He’s known for being a great two way player, belligerent and physical, useful on the penalty kill, for starting offense from the defensive end and so on. Knowing this, some will look at his 2002-03 Art Ross run and notice the insane +52 spike. Just wow! To think he managed that while also being heavily relied on for his defense!
Well, no. A big reason behind his 2002-03 spike in +/- was the fact that they used him almost exclusively in an offensive role. He’s said so as well when asked about that season, that he didn’t take many defensive zone draws that year.
So my point is, it’s not worthless, and it can be very useful as an indicator of something else, but in a vacuum it’s often misinterpreted and wrongly believed to mean something it doesn’t.