Define a good player

[Malzian]

Seems the urge to have unusual, but good discussions is strong in me, because I have the urge to throw another one out for the forums. For the last few months, I've been trying to figure out what a good player really is. My own thoughts on it are the ones who have completed Ultimate and God Kefka. For the matter, I do not consider myself a good player, because I have not completed these things or get blue parses (yes, I am aware that I will not achieve that now - but the reference point I was making was before players started getting their BiS and I did not measure up those standards prior to March). So what do you guys personally define as a good player? By your own standards, that is, not one that is drawn up by the community or by the meta.

For a little additional context, just recently, I was just tanking a run and near the end of the dungeon, I lost aggro on one enemy after a pull. Only time I lost aggro at any point in the dungeon (it was a level 70 dungeon), but to me, that's a complete failure on my part as a tank. I've been told I did good as a tank despite that, but my standards as opposed to what others may view seems to differ, so because I lost aggro once, I feel like I was a bad tank. Just for context. I'm not asking for advice or shoulder pats or none of that. I just want to know what you guys think is a good player. It can be overall, or role-specific. I just wanna know.

To note, I don't think a good player is one who had completed Ultimate or God Kefka, by definition. For me, a good player is one who can competently play their role and clear content without causing distress to the players around them. Clear the content or not, the only time for me you're a bad player is when you go out of your way to make the experience painful for everyone involved.