It's also largely on zos for failing to teach people how to play.
You would get more real tanks and dps joining random que, if people just tried.
You get a "tank" who taunts one stupid little archer and stands there heavy attacking it while as a fps you just have to kill most of the mobs 1 by 1 as everyone is running around like idiots because a tank can't stack.
You que as a tank you get these gung *** dps that just run in pew pew light attacking with a bow doing 1k dps and also screwing with your stack while running from your olo like its the freaking plague.
Fg1 takes 35 minutes and at the end you just wonder does anyone in this actually have respect for their fellow players or their time.
Personally when I entered group content more so vet level I was prepared l, I wasn't doing whatever the heck I wanted the team be damned.
I had some respect.
You can't put that all on the player though as after 1 tamerial the game has taught you even less as you can light attack overland to victory with any mismatch skills and gear.
If the quality of players using the random finder improved (probably won't happen as zos seems against teaching people how to actually play in group content) then you would actually get less fake roles, simply because more people wouldn't log off before using it...