Instead of feedback, why not let players clear a content like SSS first, before they are allowed to join the dungeon/raid via Duty Finder? Right now SSS is optionale, but if its mandatory, then players have no choice, but to put their A game on and do their best. Afcourse this will not stop lazy players who are able to preform well, but do not care about it. A good friend of mine is a Monk who is probaly one of the best dps players that I have met, but during Roulettes and 24 man raids, he half asses 99% of those runs. I asked him why and he told me, because he does not care.

Feedback is nice, but it wont help the "I play however I want to play" and the "I dont care" crowd. Atleast by placing a wall before they are able to join, you know that these players even if they half assed the entire run, are able to preform well.