I don't want to use parsers

[AyaLiz]

The only reason calling people out for poor performance is troublesome right now because all parsers are third party software and as such against the terms of service. Addon support is already being worked on (with the most recent news I am aware of being http://www.gamespot.com/articles/ff-.../1100-6425730/ ) and at that point someone might just develop a simple DPS meter addon that will resolve the problem of not being able to get DPS numbers without third party software at which point this discussion will be rather pointless.

How accurate an addon DPS meter would be is a little questionable since some damage over time effects currently aren't being tracked by the battle log and third party parsers just get that data by reading game memory which addons more than likely won't have access to. As such, unless they fix battle log being rather incomplete by the time there's addon support, DPS meter addons would probably spit out really inaccurate numbers. However, it would make for a great excuse for calling someone out for low DPS. Earlier last year someone got a warning for mentioning parsers in chat: http://i.imgur.com/OX7Z2yt.jpg
Now imagine if a DPS addon, even a very inaccurate one, existed. That GM would no longer have anything to warn this person for if he said that he got the numbers from a DPS addon and of course, nothing is stopping him from also running a more accurate third party parser to get real numbers from and saying that the numbers are from an addon when someone asks.

Edit: Of course, it still all depends on how you go about telling people that they are performing poorly. Telling someone "you're shit go uninstall" is going to get you warned/banned no matter whether or not you tell them the numbers on a parser. Having the DPS numbers readily available won't make people any more toxic because toxic behavior is going to get them banned either way.