No, the problem is literally all ADCs. Crit makes them really scary towards squishies, when they should only really be scary towards tanks. You literally cannot itemize against Corki, because Corki does 80% magic damage on his autos, yet the anti-ADC items all give Armor and not MR. Not to mention how MR is more expensive than MR and most tanks will only ever build one MR item. Lucian is gaining popularity in midlane (Faker recently picked him mid), when ADCs should never, under any circumstances, be taken into solo lanes in serious games.
I'd rather have ADCs that have really shitty AD scaling on their autos and low base AD (and no crit) but instead get lots of bonus armor penetration, so that they're god awful at killing carries but good at killing tanks. Like seriously. Make them take at least 10 seconds to kill a squishy mage or assassin, not the 1.2 seconds that you see now where an ADC with
chunks you for 2/3 of your health per second with 600 damage autos.
Either that or make it so that crit is fixed at 5% on all champions, and crit chance items now increase crit damage.
Either that or delete the class entirely and rework them into mages or assassins.