Cait is a champion that scales pretty poorly if the player doesn't have basic grasp of adc mechanics, that said, from platinum and up she must be hell to deal with :S
There's also the fact that Cait has no steroid in her kit aside from headshot, which is telegraphed, and her traps, which are 100% avoidable as long as teamfights aren't a clusterf*ck and she doesnt have a support with CC... I'd say they could reduce the range on her traps by like half if anything.
She does have 10% permanent increase in AS making any kind of AS items/masteries/runes pretty efficient on her, this mechanic could be the culprit of her oppressive laning phase since she can last hit and harass quite effectively, not to mention that her headshots seem to have a snappier and slightly faster animation.
So in theory she doesn't have an steroid but statistically she does cover herself up pretty good and that's where power should be removed since it's almost invisible.