"Swift completion" is relative to the game, not the community

[MaxCarnage]

Source: The many compliments I’ve received tanking through the 60’s in FFXIV…

I imagine it went something like this;

You: I'm new at tanking, sorry if I'm bad
Party at the end of run: You did fine.

It's not hard to be told you did fine as a tank. Have tank stance on and use at least 1 CD and that's already enough to warrant a, "eh, you're not the worst I've seen."

Most people who say they're new at the beginning of the dungeon get encouragement at the end in the form of, "you're fine" or "you did good". Doesn't make you a good player, it just means you made it to the end without the team quitting.