It's Only Preseason

Stop panicking. It's only preseason. It will change. It's not pretty now, it definitely won't be pretty for a little bit. But it's still preseason. Just chill out and make yourself a cake or something if you don't want to deal with the balance issues right now. I know it's a lot to take in, and it's super frustrating to play right now, but it will get better. Half the boards right now are complaining about OP ADCs and underpowered mages and item changes and Yasuo (well that hasn't really changed). It doesn't look like it a lot of the time, but Riot is working pretty hard to change things up and keep the game interesting. Currently it looks like "interesting" means "ADCs that can 3-shot a full build tank" and that'll probably change in the next few patches. Complaining may or may not make it better, but ultimately the decision is Riot's and believe it or not, they do care about their player base to some degree.

tl;dr chill out, everyone knows that preseason changes haven't been on par with what gameplay balance needs to be but they aren't final and there's still plenty of changes incoming