Just wanted to add my personal story:

This is my first MMO, I went from knowing nothing in June to knowing quite a lot now and I'm not a bad SMN, now doing end-game stuff. But now I want to learn tanking, so I'm leveling a GLD that is lvl 22. But… the thing is, I'm so afraid of other people saying rude things to me that I don't dare to enter through DF. The same is true about my WHM, lvl 34. I only play these classes when people in my FC have time to run low-level dungeons with me. The irony in the situation is that both tanks and healers are needed in the DF :P

I don't want to level through FATEs or so since I think doing dungeons is the best way to learn your role. But I don't dare enter through DF since I don't want to be hurt by mean comments or getting kicked or something if I can't hold aggro or if someone dies while I heal or so. I'm sure I'm not the only one feeling this way.