Riot, can you just start fresh from Season 5 and work forward from there?
I'd say it was around midway through Season 5 that I really hit my peak of enjoying this game, and I'm sure there's a number of reasons for that. Better balance, less overloaded kits, no keystones to break every champion imaginable, TEAMBUILDER, snowballing at a good balance without 4 man dives in the bot lane every time you play it, and (my personal preferred factor) old Shen back again, his current rework left him yet again in a state of disrepair. If I had to pinpoint the exact moment things started down turning, it really does feel like the Juggernaut rework rang the death knell of overall game health.
Ask anyone who's been playing for a while, odds are they'll say Season 6 was the most experimental grab-bag of a mess they've experienced in this game. I really don't think I'm interesting in going through another balancing nightmare and another season of lab-rat in this game.
All I'm sure of is I've been playing this game less and less in the last 2 years, and I started in S3. If there was an S5 Legacy server you'd probably never hear from me again.