Some GF% vs Competition charts since we are around the halfway point.
Forwards (not sure why Roy is in there):
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Vilardi, Fiala, and Kaliyev are really causing problems for the opposition playing "down" the lineup, even though ice time is pretty spread. Having 3 that can score and still play enough defense to slow the opposition is really, really effective. You can see Kempe's struggles vs last year a bit here, but he'll likely hit a streak and still end up around 30g, 50pts. You can also see Grundy's lack of effectiveness compared to how well he was playing.
I was also ready to give on Kupari, but he's been fantastic lately. Putting him down on the 4th has been a keen move, especially with JAD. I know there is always a lot of grumbling about putting a scoring prospect down the lineup as it's not putting them in a position to succeed, but Kupari is an example of a player that has flourished. Even though he's not on the chart due to injury, Byfield has played his best hockey by far up with Kopitar (he would be right next to Fiala but with Q of competition slightly positive. Every player is different, and the coaches have figured a lot out through trial and error.
I know AI comes up constantly as a trade offering, but he always faces top competition and he's always damn effective. He's a fantastic play-driver, and an absolute bargain at his salary. Arvidsson has been a beast this year.
Here is the Defense:
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Not hard to see that the 3rd pairing is really the only weakness on this team. Durzi and Roy have been passable, just inconsistent. They've been pretty solid lately. Anderson has been consistently effective game in and game out, he's one of the games better shut-down D at 23. When Durzi makes a mistake it's dreadful, but overall he's been better than last year and against much better competition.
Note that Edler and Walker really aren't that terrible, it's not like they are bleeding goals, but you can really see how the injuries both had have slowed them (in addition to Edler being a greybeard).
He's not on this chart due to sample size, but Clarke has a GF% of 44 which is lower than anyone on here. That's against competition slightly lower than Roy/Durzi. However, when it comes to dangerous chances for/against he's fantastic. He's got a DFF% of 61.2 which is phenomenal (DD is 2nd at 53.9 among the regulars). He was really dangerous but unlucky. It's a moot point now, but he can handle the NHL just fine at 19.
Lastly, Bjornfot faces competition equal to Edler/Walker, but is right at 50% for GF%. We know he's been better than both of them, this just reinforces that. He's had far better possession numbers as well and has played much better with and away from the puck.
Just a snapshot of overall effectiveness.