Like the ones being supported by statistical data. Stats are not the be all end all bit they do help to eliminate bias or subjective views.And what would those objective arguments be?
"I likey like Zaitsev, so if his +/- is low, that means the stat is badie bads."
There is a song possibility that a player can be on the ice and no doing anything wrong while a goal is scored against his team no? So while that player is playing well he gets a minus.
Also a player that always starts in there own end against the other teams best line has a way higher chance of getting a minus vs a player that always starts in the offensive zone against the other teams weakest line. No?