Lucian is called "op" because he doesn't have to pray to RNGesus to get things done
He either get things done or he gets things done faster when crits happen.
Meanwhile, all other adcs have to pray that their first 2 hits are crits so that they stack frenzy and start off with a considerable burst. Anything less is too much time and you're most likely dead soon because you can't keep on keeping a distance forever in the current state of the game.
But let's keep on pretending that critical is a perfectly healthy stat which doesn't need any change.
Lucian, and to some extent Vayne, are the only ADCs that make you feel rewarded in accordance to how you play and not just for being lucky/unlucky with crits when you actually need them most.