Summoner's Rift
Map is too small, where the game stands right now, there isn't an actual laning phase at all. Matches feel very crowded.
Map should be scaled to 1.7 size in the PBE, then tune from there and release it for the actual game.
League of Legends just seems like a brawler, constant team fights, very little focus on destroying towers or farming minions. Just group up around 5 minutes, break off to get red/blue buffs and ward, then back to team fighting (with one happening at dragon every 5 minutes).
This further supported by the fact that around level 10, a tank can aggro a turret while his team melts it and the turrets are stacked on top of each other because the map is so small.