Dubas has done a credible job thus far. My only issue with him is that he tends to let his morals govern the way he conducts business. While that is an admirable trait, I would prefer if he considers what is in the best interest of the team at all times, even if it means he has to be a bit ruthless (eg. Masai Ujiri).
I think signing JT at his cap hit was a homerun. I think signing Nylander at his cap hit before December 1st was a good move in the long run.
However, I think his loyalty to Sparks because of his affiliation with the Marlies led him to make a bad decision at the start of the season which has weakened our goaltending depth considerably. I think trading Leivo for an AHL forward was terrible asset management, and in retrospect, Leivo would have had plenty of opportunities to stay in the lineup due to injuries, which are inevitable over the course of a season. And last but certainly not least, I think making a verbal promise to Nylander that he would not be traded was completely unecessary, and could end up costing us a significant asset like Kapanen in the not so distant future, which would be unforgivable in my opinion.