Not excusing Ruff...but...
I'm guessing he has enough hockey intuition to know when a player is making an skill error vs. effort error. I think there's a difference. Luke makes mistakes but (1) he is in a position of extreme need and (2) I think a lot of his errors are just judgement/head-translate-to-action skill errors. I think Holtz, on occassion, has more effort errors. People who are making effort errors, I think, are being held accountable on the Devils.
That said, I also think you need to reward skill and ability to some degree. When Bastian loses the puck on the walls after actually having possession for the 90th time or Toffoli looks like he is about to throw up back checking because he's skating with a brick in his shorts, it's because they are limited. Maybe Toffoli is now a 3rd line, PP specialist.
I am not as much of a Ruff critic, but I definitely think he could tweak his mindset just a bit. I'm sure all the coaches weigh in on things like this, informing Ruff for overall ice time.
Now, related to yesterday's game, I really thought they did a lot of good things. But, when there was a poor line change or just a lapse in concentration, the Habs just finished when the Devils could not. Some of those crease shots were incredibly NOT goals for the Devils. I couldn't even believe it.
If the Devils were in a better position I don't think we would be as upset about last night. So, deep breathes. Let's just get healthy and crush CBJ!