Even though I have seen a couple of people in game using parsers.. If I'm not mistaken, they are misleading. From my limited understanding, most parsers work using data from the battle log. However, DoTs in FFXIV:ARR do not show up in the battle log. So if you're a job class who uses DoTs, your full damage is not going to show up on the parser. Someone please correct me if I am mistaken.