Let's find out what a random group of PUGs that required a tank, so I queued. It was almost an increase of 2. They were shocked. The other four guildies are hoping for some kind of kick. "No Problem! We're terrible." They werent but they did 5 more M+ after the first one, and taught me routes as well as mechanics. They even offered me a place on their raid team as tank or healer.
There was a person I met during my first ever guild raid stay with me after raid. She and her boyfriend helped me with gear and brought me my SL lego. The guild was not friendly to me personally and I did not invite me to the next raids and I've never ever raided since.