Jet fan here.
Copp is really good at all the things in the game that need to be done but aren't exciting. Great defense, on the boards, turning the puck over, the puck just ends up being in the other team's end more often than not. If you are looking for a guy who looks pretty out there he isn't your guy. He's going to go straight line to where he needs to be and just out compete it is opposition. He just puts the puck where it needs to go so it rarely looks spectacular and he does it very consistently from game to game. From what some of you are saying about Panarin they seem like a good fit together.
Don't expect him to carry the offense, he is more there to enhance it. His ability to have the puck in the other team's end is like a magnified glass. It makes both offensive and defensive lines look better. You want to put Copp on a shutdown line with some grinders, he will play 0-0 hockey against the other team's best. You want him to do the heavy lifting for Panarin, he won't look like he's floating if Copp is out there turning the puck over.
As a Jet fan I like Copp more than most. I think the Rangers absolutely stole from the Jets in this trade. He was 3rd in TOI for the Jets and it seems your coach likes him too. To steal a term from Paul Maurice, Copp is Coach porn. He plays the game the way coaches see it. Doing the little things that might not get noticed right.
Good luck Ranger fans, I'll be watching them in the playoffs.