Having finally managed to get a PuG for the last part of Ulduar 10, I've decided that it's actually harder than any of the bosses in Trial of the Crusader.
If you touch a cloud in Yogg-Saron's room, you spawn an add. This means that, unlike most fights where stupid people kill themselves when they do something wrong, they stay alive and continue to be stupid.
My PuG broke up after a few attempts on ol' Yoggy due to firstly people touching clouds and spawning adds, and later people avoiding clouds but not actually managing to DPS at the same time. I could hardly believe that phase 1 of Yogg would defeat a group of fairly well-geared people (at least a few of them had a mix of T8-9 when I inspected them), but a couple of the more seasoned Uld10 PuGgers just got sick of the "noobs" after awhile and quit.
Ah well, at least we managed to one-shot Vezax, which seemed a pretty fun fight. I'll have to keep trying for another PuG or wait for a long-running guild Uld10 to catch up (the ID has been extended for at least a month so far to try and get enough people to finish it; we're mid-keepers so not too far off).
On another note - Yogg was the first fight in a LOOOOOOONG time that I've felt Hawk Eye was actually useful in a raid - I found myself out of range quite a few times while dodging clouds, so I'm pretty sure our failure to get past the first phase was partly due to everyone else not having the luxury of my 41yd range.
Well, that or all the DPSers were the type of people that do zero DPS on the dancing phase of Heigan because they can't do 2 things at once, which was also possible. It was a PuG, after all!