I've listened to alot of complaining...
For squad arena:
It's irrelevant that you can't use just resistance. A well modded rey, jkl, gas, jkr, gk/hyoda is definitely on par with kylo and even without jkl there are a lot of people that climb fine against all different kylo set ups.
As for rey mirrors: They are are tough, well so were jkr... that's just bad luck and shouldn't come into any reasoning.
Kylo is better at raids:
This was always the case from the start anyway and everyone knew this. So again this shouldn't come into any reasoning.
So it comes down to TW and gac:
In most cases rey users set her on defence (with all resistance) and it either takes a gl or a counter that involved taking a relic 7 gas away from the clones or splitting apart multiple squads (stealing gba and thrawn to go with dr). Again this is fine since there is an advantage if your opponent has to split up multi squads to counter your rey...... You shouldn't think you are entitled to your rey holding for 10 battles as was the case when she was first released.
So the only issue I see is the vader counter and I agree that either she should receive something to stop this or his kit gets changed slightly to make it a lot harder to counter rey bit that's thethe only issue that should be argued.
If you are struggling to beat kylo with rey, it's your mods/strategy which is the issue and this has always been prominent with all metas and just cause you have a gl doesn't mean your entitled to win against all other gls even if your mods are rubbish.