Pugs vary, just as people vary . I once pugged a Heroic 4 and didn't know the quest, so kept messing up. I was getting griefed by people. It turned me off group content for a long time. I've since started doing group content again, and when I occasionally have trouble, I get helped, and one time I had to leave due to rl after a wipe, and ppl were asking me to stay.