Lessons from LCS
Orianna has been overpowered for the entirety of League's existence. Even Syndra has to work harder for a kill than Robo-bitch and her 1-shot. There has not been a season where anyone was able to deny her farm, starve her of mana or duel her, and she has the most teamfight presence of any midlane champion. Surely someone should have noticed this in the last decade.
Baron is a measly creep - it is intolerable that the game-winning buff can be taken in a few seconds. If you doubled his HP and quadrupled his damage, he would still be weak.
Two incomprehensible mistakes from Riot. These things are OBVIOUS and easily fixed. But no, maybe reworking Ryze for the 111th time will make more of a difference.