From Challenger to Bronze in a rotation of the map.
This is my match history, the stuff crossed out in purple is my games on purple side. The title is a little inaccurate, I am not actually challenge tier, nor am I really bad enough to get stuck in bronze, however, the gap between how well I play on each side is massive, I see it in my team mates to, and I've heard many others complain about the same issues.
You get more vision above your character than you do below, allowing enemies to auto you from off screen if you lock it. Skill shots are easier to aim upwards than they are downwards when aiming at an angle.
To fix the first issue you can unlock your screen, but that just gives a now issue, now you don't suffer from purple side disadvantage but suiside disadvantage. (spelt incorrectly on purpose for bad pun) I lose track of my character all the time in unlocked screen which just makes it not an option.
Riot please, let us rotate the map.