Jesseh here's the thing. Your expectations of the guild and the underperformance thereof is your own thought. No one wanted you to judge and evaluate on how they're performing.
If you feel frustrated over people doing badly then that's your own problem. If some people fuck up mechanics and do poor dps then that's they're own problem. Some may just naturally be slower at learning the game or just equipped with a lower skill cap. But it doesn't mean they have to fix that - ATR focuses on holding hands. However, if they are aiming to do well, then they are the ones who should be feeling frustrated, not you. There is no reason for you to get mad over that because the ultimate goal of ATR isn't hardcore progression.
Some people may not want to push for mythic but are just going along because they want to raid with ATR. This may or may not lead to such "underperformance" you are sick of.
It goes the same for you - you continue playing assassination because you don't want to learn subtlety even though it puts out the most dps. And you whine about people not eating 125 2nd stat food. 25 more stat will boost one's dps by some number of course, but it'll surely be less than the difference between the best dps spec and another (simcraft dps charts show this). Now I'm not telling you to go play subtlety and practice your rotations to dish out 100k dps to benefit the raid. I'm just saying even you are not going 'above and beyond' to push progression. Just like how you feel it's too much trouble to do so, some people find learning how to play the game 'too much trouble'.
I practice my rotations, constantly look up forums and ask my Korean overlords on how to squeeze out more dps. I change my trinkets, talents and glyphs on bosses that need to be changed for to see that pink line at the top of the dps meters. If paladins had another dps spec that did more dps than I'd instantly switch. The fact that I try hard playing this game is clearly shown by the meters. So what do you think you look like in my eyes? Bluntly put, it just sounds like you're whining about some people doing worse than you when there are multiple players who do much better than you and put in more effort into playing the game. If you have room to learn and improve, why don't you spend your time improving your own self instead of worrying about others?