Heroic Tomb PUGS have been a disaster lol
I don't pug that much in general, but I used to join pugs occasionally for tf/ap/legendaries/practice and it was okay as long as you joined a decent looking group
But ToS has just been terrible, haven't managed a single boss kill in the handful of groups I joined lmao. Think it's a combination of an unusually harsh raid environment, and the fact that the catch up mechanics can easily put you on par with actual heroic raiders. My alt is 930 and has literally never done a raid.