The current sate of the gameplay is not caused by the Preseason, but by the Players.
Sure there are a lot of balance issues, but they aren't that big. the biggest issue this Preseason is the sheer amount of changes. And it's not even what changed, but simply that it changed.
Sure games are quicker and often teams get stomped, but as far as i can tell that is msotly casued by people not botehring to read teh patch notes, so they don't have proper Masteries (if at all) or otherwise don't have a clue what is going on, or how to use the new items play against the changed characters.
Usually those games end so fast because there is one such guy and they end up being 4v5 or 4v6 because clueless guy feeding is even worse than afk.
Personally I like most of the changes so far as i didn't have much problems adjusting my setups and gameplay accordingly. I also haven't seen many problems in game with those alegedly overpowered ADCs. At least nothing that is different from Season 5. If they get fed they are a pain, but they always were, and you can still handle them like you always could.
Also for perspective: I play Jungle
, and Support
