Of course you look at individuals separate from team results... I can't believe you're even attempting to argue this.
Like
@kudymen said, by your logic Giroux is a failure too... which obviously isn't the case.
For individuals, including Jake, you look at what positives they're providing (Jake's is scoring) vs what negatives they have (Jake's is defensive play). I think it's pretty clear that he causes goals for (whether it's goals or assists) more than he causes goals against, especially in a normal year when the PP isn't broken so he's scoring there too.
And your Hagg example makes no sense because accumulating hits doesn't help the team win. "Excelling it hits" means nothing, so it's not a positive in his favor.