Gonna leave my three cents here.
M+ has always been a challenge. This is coming from someone that has plugged KSM since mid SL through DF, even got a few KSH’s in there. If you bunk up a mechanic, it doesn’t matter how well you’re talking or don’t talk. You die.
The problem right now is that with hero classes, and the general difficulty curve since the M+ rework, groups are only taking “meta” more than ever. You better be playing a spec and class that is in the top three of your role or you’re boned.
I’ve sat for HOURS applying to keys just to get bluebballed and say screw it and log off.
The dungeons are not difficult. The fights are pretty standard. Problem is people.