Funny enough, I was in AV the other day on my AST alt at level 49 - about 85% of the XP bar full. The run was pretty rough with slow DPS and a PLD tank that rarely used flash. I hit 50 during the trash before the final boss and decided to just finish it out.

Tank proceeded to get hit by the last boss's Bad Breath twice - TWICE. After the wipe, I just left. I'd rather do my class quest than deal with that.