Canucks fan here.
Gudbranson had flashes of good play every so often with us. When he plays as he should he's a simple defenseman with limited upside, chip the puck out, take the body, clear the net. He's not good for more than that even at his best. I don't know your board or how objective it is so I could be off on this but you're probably looking for him to play well, to find some good in the trade too.
At his worse, he tried to play like he has actual skill he plays outside of what he can do. That leads to overthinking things and once he starts thinking he's a step or two off the play. You can mock the Canucks defensive core, but Edler, Tanev, Hutton, and Stetcher aren't as bad as our team makes them look. Every player that Gudbranson played with has worse numbers with him than without him.
Maybe some of his issues were coaching related and our coaching staff was giving him the wrong advice or killing his confidence which caused him to overthink and play awfully but I'm not sure that makes much sense. Schenn stepped in for us and hasn't looked awful, he's playing the game that you say Gudbranson just played for you. Simple game, makes the smart play, gets pucks out, puts pucks towards the net, doesn't pinch. The kind of game you want from a 6/7th defenseman.
If we got that from Gudbranson he'd still be overpaid at $4 million per season but we wouldn't have called him the worst player in the NHL. There's no beef between the Canucks and the Penguins so if Gudbranson keeps playing simple mistake-free hockey for you guys that's good. I hope Pearson can have a similar turn around with our team and get back to his 40 point top-6 form.
Just my take on things. Best of luck with your playoff hunt and if not best of luck at the draft. Please don't win the lottery and bump us off a pick we desperately need to hit on.