Game play and Balance
IMO Riot has finally come through with their promise on Balance. Most champions are viable right now, most champions have a solid build path, and the game is based more around personal decision making then it was before. The most OP champs aren't popular, and the most of the super strong champs need time to ramp up leaving them with large windows of counter play. In the LCS there are a couple of champs that are just stupid strong, but in solo Q it seems like the 6 bans are enough.