The rebuild started on March 27, 2013. We're not even 4 calendar years into the rebuild, and people have already taken a hard turn against pretty much all of the young promising players.
Take a breath. Look at comparables, and show some patience.
Look at Sean Monahan's draft year - he is the best, if not 2nd best centre taken in that draft. No one taken behind him is even close to being as good. You can argue Barkov Vs. Monahan all you want, but the fact is Barkov was taken ahead of Monahan and should be better. Mackinnon hasn't been able to hack it as a centre. Monahan is also scoring at a pace that would see him surpass Jarome Iginla's franchise record for goals scored. This turncoat attitude towards Monahan is embarrassing. Yeah, he's struggling under a new coach, but so is the entire team. Stop singling out individuals.
Everyone throwing their arms up in anger and attacking Bennett/Monahan/Brodie/Giordano/Hamilton/Gaudreau - you're showing you lack an understanding of not only the ebb and flow player development, but also of team development. Showing frustration is understandable, but turning on your own players this quickly, without any actual investigation into why they're struggling, and throwing away previous years of progress...eeesh.
Patience is a virtue, and development paths are not a straight shot upwards.