Maybe my problem is patience =(

I've been Healing & Tanking in MMO's since the beginning of the MMORPG era back when they were text based.
I've healed and tanked in end game raids for so many games like WoW, DDO, Aion, LOTRO, etc. that coming to this I find healing easy and group sizes small.

So when I come in here, yeah, I learn a bit from these failures but I honestly feel like I'm playing the lottery.
Finishing these runs has nothing to do with my skill, it's all about the luck of the draw whether or not I get 7 other random people also capable of finishing it.

Even if it were the same 7 people over and over people learn from mistakes, but it don't work that way with random groups.
The length of time in a games life cycle before PUG groups start running what "was" end game content is very slow.
By the time you can run it in a pug, it's not end game content.