Flash Pwns All
Over the last few weeks I've seen a lot of people complaining about the power of the teleport spell. However, Flash is being used on nearly 100% of every champion being used in Worlds. Even in solo/duo queue, people will complain if you don't have Flash. In my opinion Flash is more overpowered than Teleport, and because of its strength it prevents people from taking other, weaker, summoner spells. Riot claims to like parity in it's game, but Flash is imbalanced compared to the other summoner spells, and offers a greater utility than any other summoner spell. I'm not hating on Flash because I abuse it too. But when the game is in a state where if you don't take Flash, you're screwed, that's a bad state.