When the decision was made by whichever side one wants to blame that Pietrangelo wasn't coming back, someone had to come in as a replacement. We can discuss who it could/should have been, but the pickings were slim. After Krug, it's Tyson Barrie (right-handed), Kevin Shattenkirk (right ... and, we've done that experiment before), Erik Gustafsson (left), Sami Vatanen (right) and Jake Muzzin (left). There wasn't a hell of a lot out there.
Is Krug horrible? No. Is he playing like a $6.5 million defenseman? Um, no. It's not that he's terrible, just like Faulk isn't terrible. It's that between him, Faulk and Parayko they're making $18.625 million and counting $18.5 million on the cap, and you can't point to any of them and say "yeah, there's a true #1 defenseman this season." Faulk was playing more like a #1 early, he looked really good, but he's tailed off as time has gone on. It's like we got a pair of 3s and we're waiting to see what a healthy Parayko is. If he isn't a legit 1 ... well, look at Cup winners and find all of them who didn't have a true 1/2 on the blueline, someone explain what's going to be different here. And if Parayko does turn out to be a legit 1, will Armstrong pony up the necessary money for that?
I know what you were trying to get at with these two statements, but seeing those two sentences back-to-back in reference to +/- as a valid stat is kind of funny.
Dunn can be really good offensively. He can be really not good defensively, which takes away from his offensive game. If he were to have some 20-42-62 kind of breakout season, maybe that changes things. Krug is getting used more on the defensive side, which historically he's not been used in. That's impacting his play. We talk about zone starts (which I think is generally overrated, but that's another discussion); Krug was 62.6% offensive in Boston over his career. He's been 53% here. The '15-16 season in Boston, he was 55.5% and it marked his then-lowest career goal output at 4. We also talk about shooting %, especially in relation to a couple forwards. This year, Krug's hit on 1 of his 97 shots on goal. If he were just at his Boston career average, he'd have 4 more goals. Doesn't sound like a lot, but that's 4 times where we're putting pressure on the opposition instead of having to play defense and us chasing them.
For whatever reason, Krug here isn't what Krug was in Boston. He's got to be that to make him worth that contract. If that's just getting luck shooting, if it's better usage, if it's better play from guys around him as well, whatever it is, something has to improve if he's going to find his game and be what we were told he would be.