I think CTR has bearing on QS, but who knows the exacts?
Curious because I'm currently testing something along that line.
One ad group written with all their suggestions, and a 5-bar QS. - Lousy CTR, and low results performance One ad group written with my normal catchy type ad, and a 3-bar QS. - Great CTR, and good results performance
Starting to think that they should dump QS scripts, and allow those of us(that can write good copy) do our jobs.