Question on DF expectations

[tinythinker]

I refuse to carry people through content and let them pollute the DF even further. It sucks having to wait for new tanks and healers sometimes, but people need to know when they are bringing the team down so they can fix it. If I am playing like shit, I expect similar treatment.

So what qualifies as being "shit" and "polluting" the purity of DF?

If I forget or am just out of practice on a boss fight, and there are some close calls or a single wipe, does that qualify? Does it qualify if I told the party at the start that it's been a while? If the healer or tank can't do massive pulls, is that player ruining the run because you have to go through the instance more slowly?

I am not dismissing or mocking your position, but it's very vague. That's why I tried to give examples in the OP. "Know your stuff" and "play reasonably well" can mean very different things to different people. I personally don't think the above makes a player's effort shit, but I can only speak for me. I know for a fact that many players would think such situations are hellish crosses they must bear. Which is why I think it's good for people talk honestly about what they expect.