No time to read the whole thread but wanted to share a recent experience to see if this qualifies...

I went into the Rabanastre dungeon last night for the first time (as Ninja - 320 iLVL) and while I studied up on the mechanics it was still a whirlwind and tough at times. I died a couple times and we only wiped once, but towards the end the Tank marked with with the 'X' target, then the Healer added the 'Do Not Attack' (I think - circle with an x in it) on me as well. It made seeing everything a lot more difficult and I didn't know if this was their way of saying, 'You suck dude,' or if there was a strategic reason, or if they were just screwing around. I didn't report anyone, but figure this is the place to ask (and I'm working on getting better!).