Please look at ADC itemization

ADCs are in a bad spot because they lack impact in the early and mid game. Buffing lane bullies like Lucian is nice, but he will still do very little because of how stupid AD itemization is right now.

You're pretty much FORCED to build the same 3-4 items every game or do practically no damage until late game. The way crit/as/ad scales together makes ADs late game monsters, but to be doing relevant damage you need 2 zeal items + iedge + lw and another AD item. It's not like if the mid syndra is 5/0 you can't be like "let me build hexdrinker before my IE to delay my powerspike by 1100 gold making me pretty much worthless haha". SURE you can build Maw as your 5th item, but at that point you're gonna get 1 shot by that syndra through Maw if you misstep so why even bother?

You're forced into these glass cannon builds which deal no damage early. Unless your support literally sits on top of you nothing stops a hecarim or vi from 1 shorting you because towers don't protect you at all, and you will deal 0 damage to those champs. You feel so worthless as ADC because it's not dependent on how well YOU can play, but really on how well your support can protect you so you even have a chance of doing damage.

Only reason vayne and twitch are doing so well now is because they get free AD in their ultra, which forgives the double zeal build because now you have "free" ad which allows for huge I.E. crits without needing the extra scaling items. Twitch also has impact midgame because of his stealth for picks, and vayne because she has true damage and SAFETY in her kit with condemn and stealth+tumble. It's very dangerous to dive a vayne.

Also on boards I hear people complain about ADCs being too strong because they will kill a tank in 3 seconds and lifesteal too much. I don't understand this at all. Do people think ADCs start with 13k gold? To be doing that you need IE + 2 crit items + LW + lifesteal item. Even then one misstep from the AD will result in then getting instantly popped with even a semblance of coordination. But I agree, ADs will do a retarded amount of damage and THATS WHY they get focused so hard so they don't get the chance.

I used to main ADC but now I main support because I feel like I have more impact. I would reccomend watching the latest "Beyond the Rift" by Imaqtpie and Scarra where they discuss this in more depth.

TLDR: The way AD itemization is right now is just stupid. Until late game you do have very little impact, and when it reaches late the enemy team is FORCED to bum rush you because if they don't you will delete their whole team. It makes it super super frustrating to play the role.