Don't poop on a piece of bread and tell me it's nutella. The guy is a career .3ppg player without the defensive game to be put in a checking role. He's a possession black hole to boot. He's out of the NHL this offseason most likely.
Again, don't speak about someone you have no idea of. When Grigorenko is on the ice he is the generally the guy with possession of the puck. I would love for you to steer me in the direction of a stat that says he's a poor possession player. Shot generation/suppression is definitely weak, but not possession.
He isn't bad defensively. Very good positionally and pretty good stick work. Unfortunately he doesn't engage his body into any battles and that's where he's weak. But not bad defensively. In fact when he plays his natural position of centre he's pretty good defensively especially down low. His downfall is the use of him on the wing when he fails on the boards because of his body engagement. I'll never understand why a coach would play him as a wingner when you look at how much better he is at centre.
His production hasn't been great no doubt, but his usage clearly plays a big part in that. He trails only Mackinnon, Duchene and Landeskog on the Avalanche in points/60 since he became a member of the team. Each of his 9 most frequent linemates over the last 2 seasons have their GF60 higher while on the ice with Grigorenko than when they're away from him. He makes people around him better. Especially Mackinnon and Duchene who's production skyrockets with Grigs compared to away from him.
He needs to learn to engage his body and "want" the puck more or coaches aren't going to want to put that guy out there and his ice time over his career shows. But to say he isn't an NHL caliber player is almost as dumb as your other recent comments of saying Nathan Mackinnon has a "muffin" for a shot and that Tyson Barrie "sucks" and "is trash". If you aren't willing to watch a team play hockey that's fine but don't make up false opinions on them.