I managed to get one person to play the beta version of the starter set that was sent out as a PDF, they chose to play as Fiora. I struggled to maintain encounters at a level where quite frankly they were not out right overwhelmed. I tried to keep it to one threat level to make things more even and had to downgrade the Frostbane to only have a single action per round, nerfing it's healing ability and damage die, and even then it was still very difficult. I believe the starter set is clearly designed for 4 or so players. I appreciate that they tried to adjust it for a lesser amount of champions but it is still not exactly balanced.