Are you saying he has bad hands because he's not scoring? I'm trying to understand because from my viewings Dzingel's hands aren't a problem. He often uses his hands to escape traffic and create chances for himself. His biggest problem is finishing by far, imo.
Sorry, I should have been more specific. I mean, he doesn't have a plus shot, and to make matters worse, he has a harder time handling and shooting the puck at high speeds, which is where an above-average number of his scoring chances (when compared to a regular player) are going to come from. He takes way too long to wind up his slap and snap shots, which lets opposing defencemen adjust to the play. His wrist shot is average at best, and below average when he's trying to get it off while skating hard. He has an active stick and a good eye for the puck, so in those regards his hands are fine. He just lacks finish at the speed (ie: reaction speed with the puck on his stick, anticipation of the play that requires faster decision making when on the fly, a good quick shot) that the NHL demands of it's point producers.
His breakaway-speed moves that worked for him at the NCAA level once he finds a lane aren't the kind of high-end moves that fool NHL goalies for the most part, either.
I'm not trying to dump on the guy, he's a fine player, but that's all he is - fine. There's nothing wrong with just being a good bottom line winger in this league.