Yesterday I was doing story Ravana as a tank for a healer friend. We weren't able to kill the adds, even though we tried 6 times (there were always at least 4 swords up when Ravana used its ultimate move and we just wiped every single time) despite both healers DPSing as much as they could in that phase. Turned out all four DDs were doing less DPS than either tank (who were using full tank gear). One of the DDs said in party chat "these DPS suck" and left (yes, despite himself having constantly done less DPS than the tanks on all 6 tries). We ended up vote abandoning the fight. The DDs will probably be carried through the fight in some other group, imagining they're doing super and just ended up in a bad party (like the guy who left, blaming others). Without a parser they will never know how they're doing and they will never get a chance to improve.