as an adc main I'll tell you why Caitlyn is both total cancer, and should also not be "nerfed" but rather changed to make her less frustrating.
Why shes cancer:
Oppressive lane phase if played properly, there aren't many champs who can do anything against her if she decides to auto push a lane. her range is oppressive but even against similar ranged adcs (Ashe, is only 50 range less I believe) she can just push in the wave with peace maker.
She can place traps UNDER your tower where you CANT SEE THEM. and they do FUCK TONS of damage. this is toxic as fuck as it isn't skill for the enemy cait or you to dodge. its just her pushing you by default and then cheesing you with traps under tower.
If you try to aggress on her, her escape can be used OFFENSIVELY to get a head shot for fuck tons of damage. nevermind that it already slows to allow her to kite you with her ginormous range.
Why she shouldnt be nerfed.
She's balanced around having an obscene early and late game, but where most games matter she is actually and quite literally trash tier. her mid game if not stomping lane is quite bad. and by stomping I mean destroying the game. not just being up. if shes mostly even or only slightly ahead she just doesnt do that much damage in the mid game outside of her lane phase.
While very strong, she is relatively immobile. she needs to be relatively strong to make up for that slightly. definitely not akin to an ashe, varus, etc. but she needs to be strong with her autos since thats pretty much how she's going to do be doing her damage. shes not spell casting or weaving in shit. shes just auto based making her limited in what she can do.
My suggestion to make her less frustrating is to make traps time out under an enemy tower quickly. i dont mind her using them directly in front when sieging. What i do mind is that she can make it incredibly difficult to farm under tower without getting head shot constantly and you know shes gonna push. she's caitlyn. Don't even need compensation for that. Just dont let her place traps under tower. make her place them anywhere else. Her net should not proc a head shot. there I said it. it gives her burst damage on anyone running at her which is just silly. thats supposed to be an intended weakness. Here you would need to compensate her since thats a BIG blow. I'd say give her an attack speed buff she lands her E so it rewards caitlyns who kite after landing E and not just mindlessly shooting you once for 30% of your health with one auto.
overall though while caitlyn is toxic, she doesnt need nerfs per say outside of her traps not working under an enemy tower for very long.