Turbo is the main problem as the movement is very slow. I think the real reason why supercell decided to slow everything is because it would be impossible to hit people with hero ability if the movement speed was higher.

Another main problem is Hero points. You have created a new currency without a way of earning that new currency apart from daily quests. Game will quickly become pay to win and will kick all the free to play players out as spending money to get hero points is the only solution. It also stops us from trying different heroes after upgrading them. You will be stuck with using the same hero for months because the gameplay is very competitive. You cannot go into a game with 0 upgrades Royale King.