I kinda disagree with Lucian being strong. Draven is busted though, he has been the best ADC in bot for a few patches now, ever since bork got nerfed and Cait can't use Runnans as well.
For starters, Draven is busted
That is a huge understatement, in my opinion, I know Draven has always been about doing huge amounts of damage, and it was okay when the cost of crit was what was really holding him back. Now, however, he can go full ad due to the changes to his Q. Furthermore, he really doesn't have a weak spot anymore. Becuase of his passive, he is always getting more gold than a marksman who has the same stats as him (Kills, deaths, assists, farm etc.), and Fervor working the way it does, prolonged combat with Draven gets riskier. Most champions that can burst like that lose a lot of their power, but Draven retains it due to the mandatory management of your axes than any Draven needs to have.
Lucian is another story
So the issue is actually bork, not Lucian. So the way new bork works, it apply's its bonuses per auto (not the active). Every time Lucian casts a spell he gets 2 autos, giving him twice the amount of use from bork, as say a Kalista or Varus. This isn't a Lucian issue, it's a bork is still broken on Lucian.
So how can this be fixed?
Ethier another Cait nerf needs to happen so it specifically cannot interact with Lucian the way it does now, or bork also needs to do reduced damage along with the light slinger proc.
Its not that they're unbeatable, but you are right, some fine tuning to both of them needs to happen so we don't have another round of only 2 different ADC's showing up in games. Remeber, nerfing bork will kill some other champs that need it, so it's just the interaction with Lucian that is the problem.