Tactful ways to inform people that they're playing badly?

[Rhus]

you are a random nobody.

Sounds like you're trying to channel your inner Emet-Selch.

"You are a mistake. For we who have known perfection, this shattered class and these parses are ghastly mockeries of the true player" or something like that.

[Vulcann]

Sounds like you're trying to channel your inner Emet-Selch.

"You are a mistake. For we who have known perfection, this shattered class and these parses are ghastly mockeries of the true player" or something like that.

i love when people's egos are hurt and they get all up in arms over this statement. its not an edgy statement its literally the truth. i ran 5 duties last night in roulette, if you put a bunch of players in front of me today and told me to pick out my group members ... i would have no idea. that's the point I couldn't tell you Y'dyalani Rhus from XXSephirothXX sixninesixnine to Waifu McAnimeName to Kloud Stryfe to Jayna Proudmore. so why would i take advice from you? for all i know you could be the worst player in your guild the player that no one wants to take, or you could be the type that everyone immediately messages to get in their group/raid.

no one besides your guild/clan or friends know you so i ask again why should i take unsolicited advice from you?

[dragonkyn20]

Sounds like you're trying to channel your inner Emet-Selch.

"You are a mistake. For we who have known perfection, this shattered class and these parses are ghastly mockeries of the true player" or something like that.

This is why people should read through the full thread before replying. I would've missed this gem if I went straight for the last page.

As for the topic at hand though, more often than not trying to tell a random player they're not playing optimally usually ends up with them getting offended over it. As multiple posters have stated before, it's usually not worth trying to force the issue. Offer a suggestion and if they don't want to hear it, either leave and try again with friends or suck it up.