So many changes on PBE, I just find it easier to tune it all out and wait for them to go live. That Nasus skin does look badass.
ADC is my most played role but I got to gold playing top/jungle. Since the Sivir remake I've gone back to trying to get ADC every game again. Sivir is just hella fun. IMO she plays a lot like MF. Both are AOE comp ADCs. MF is a better duelist while Sivir actually sucks in a 1v1. Sivir is great for team fights and can poke from pretty far away for safety.
I've never been good with the duelist ADCs like Vayne/Quinn/Caitlyn/Corki/Graves and I actually tried hard to make these champs work for me, just couldn't. I'm 15-41 with these 5 champions combined. Only 28% win rate.
I've always preferred the safer support-style AOE/CC Comp ADCs. MF/Jinx/Sivir/Ashe have been my preferred. I'm 326W 247L with MF alone, 57% win rate. I'm at 49% win rate with Jinx/Sivir/Ashe combined (so almost 2x as effective than if I played the duelists.) Ashe is the only one that is under 50% and I don't really play her anymore because of that, but I still feel like she can fill a specific team comp in some instances.
For carrying hard I love Kog Maw but the Assassin meta kinda fucked him. He's still "ok". I'm 17-6 with Kog, 74% win rate. He melts tanks though and can out-duel any other ADC. Against tank-heavy-assassinless teams I would still consider him.
I never really got into Varus/Twitch/Tristana, I have 0 games with Trist/Twitch and I'm actually 2-0 with Varus but just don't find it enjoyable playing him.
Ezreal I consider to be more of a caster-adc or duelist and again, my performance is not so great with him. Only at 39% win rate.
Lucian on the other-hand is the one duelist I've done ok with and sit at 53% win rate.
To conclude: There's a ton of ADCs out there and while the concept of ADC is similar among all of them, there actually are some significant differences between kits. You just need to find what suits your playstyle best and who you enjoy playing the most.
typically an ADC's job is to farm into the mid game and then eliminate single targets once you're fed.
This is true but I find the most important thing for an ADC is to come out of lane EVEN or AHEAD. How many games have you played where bot lane feeds? It can be devastating. ADCs can win the game within the first minutes of the game. If you can land first blood or even a double-kill you can end the game quickly if you take advantage of it. I've made opponents rage quit a ton because I would keep pressing my advantages to the max. I just had an MF game 2 days ago where I went 13-1-15 and the game lasted 20 minutes. I ended up getting the coveted double kill than kept pressing until even the Jungler couldnt help, we would 2v3 and win easily. I had a game yesterday where a duo wanted bot lane, I hesitated because most of my duos have fed hard recently, but I took mid and this duo team won us the game. They had the inhibitor turret dead before any other lanes had the 1st turret dead. I ended up winning my lane, too, but it helped that there was no jungle pressure to deal with.
Even when I play Tryndamere top or someshit where the goal is split push and draw pressure, if my bottom lane feeds too hard it almost becomes hopeless. Bot laners really need to contain the damage to give their team a chance. I will admit that sometimes I get myself into trouble but I also know when to just sit back and wait for late game. The biggest problem I have with bot lane is when my support isn't on the same page and ends up dying like 6x because they still want to be aggressive when we're behind. That's why I had transitioned to the other lanes/jungle, because you can determine the outcome on your own and aren't reliant on a 2nd person.