He was brilliant at the start of the season, but has been awful of late. Unfortunately, a big problem with Duchene seems to be in his head. It has happened before. He starts to struggle, he starts to overthink, he puts way too much blame on himself, and he becomes completely ineffectual. Hopefully he can eventually overcome it, but I wouldn't be surprised if he always struggles with it. It's legitimately a massive problem with him, and something he's discussed before.
That being said, all of the Avs supposed young stars have been pretty awful. It's ironic, at the beginning of the season I'd have told you it'd have been the Avs goaltending, defense, and older players/lack of depth that would have killed them...It's funny, if Duchene, ROR and MacKinnon were even playing at the level they were at last season, the Avs would be in a playoff position right now. The three point leaders on this team are Tanguay, Iginla, and Barrie. It's both encouraging and incredibly worrisome that the players who are supposed to be the Avs best are the main reason for their struggles.