I have never been a big fan but have to admit his game has really improved under DG.
Not sure his current level of play is only “average” for a third liner that can play center and wing and get some PP time. He is a 50 point player this year and he played most of the season with Olofsson and Jost, not with Tuch and Skinner.
So he is a good 3rd line player that can chip in as a top 6 if injuries occur. I’m too lazy to compare him to every teams 3rd line forwards but I would suspect he is above average in that role.
I see him on the team next year but with Savioe, Kulich, and maybe some others emerging, he may be gone after that.