People rag on Mitchell because he brings it on himself a lot of the times.
It's not that he "doesn't know how to pass" (though that is an area of opportunity for him to try and improve in) but that he doesn't a lot of the time, he'll circle around with it, try and go back near the blue line and attempt a soft, backhanded pass 90% of the time which always ends with it being intercepted or not on target at all and the Avs lose possession of the puck.
I'll also not be forgetting anytime soon the play where he just stopped hustling and lazily skated back to the Bench that allowed the other team to score on the Avs last season...I thought for sure he was going to be riding the bench after that but it didn't happen. It was just a terrible play by him as you could blatantly see the lack of effort in him at that moment.