PSA: As long as ADCs have crit and attack speed together in their items, they will never be weak.

Itemization for marksman is simply the best in the game; they have every stat they could ever want and then some. They have the highest DPS in the game, turning them from objective-focused hit and run to 1v5 snowballers.

The reason Marksman are "weak" is because of the turret changes, which favored clown fiestas bot lane to snowball the turret because the turrets are so weak. Marksman are, and have been since the introduction of crit, the singularly most powerful and dominating class of champions in the entire game.