I've been playing since season 2. I've just uninstalled.
Honestly this game has gone completely to the dogs. I love what the lore team is doing and some of the concepts are really good. But the ever increasing non-counter mechanics and "periods of power" is beyond comprehension across the board. I studied computer game design and it's baffling to me why Riot is taking the game mechanics in this direction. The worst part of it all is the game speed.
I came to this from playing RTS games and so obviously I enjoy strategic elements. That has been completely gutted from the game (from a SoloQ standpoint). No longer can I focus on my own development through the course of a game to hit the late game with a build that suits my teamcomp and style. Now it is purely on nailing a good 8 minute laning phase and then it turns into a less fun version of ARAM.
The new runes are absolutely counter intuitive. They are supposed to create a "unique playstyle" for each champion. Wrong. All they do is stat check different playstyles. You cant realistically run grasp as Jax and expect to win. Or conquerer on teemo. It's simply not optimal, so everyone simply takes the optimal keystone for their champion and in rare cases do you have more than 2 viable options.
Before these runes and keystone BS you could customise your playstyle with real stats from the old rune system and I swear by this - I used to have far more diversity in my own playstyle and builds. Now it is purely optimal or you wilt into getting stomped. Absolute garbage. Riot you have destroyed this game with some real backward thinking. Revert the game to season 3 or 4, keep your shiny new graphics and put your resources into lore and cinematic development. Constant changing for the sake of change has left you with a product that isn't fun or intuitive any more. It's a spam fest and ARURF epitomises that. Not onyl do you get a game mode that is typical of modern brainless games, but you can't even choose your champion and you hope the other team doesnt have Yi, Zed, Vlad, Jax, Fizz etc.
What's worse is remember when URF first came out? It was an April Fool's mode and the tag was "the future of league". Well, if you look at all the changes that's been made to the game then this is the longest April Fool's joke I've ever heard of.