Wait for it... there are a lot out there... You've just been lucky.
I made my second cleric a while ago and went through pug hell for the first 10 levels, after that I started running with friends and guildies till 11 and then started just soloing everything I could to keep away from PUGS.
Don't get me wrong, for the most part it will be okay to good... but about 25% - 30% of the time you will want to and may pull some lungs out.
Especially as you start running with Barbarians and Tanks that don't believe in spending cash on heal pots or giving you cash for wands.