The game as it is seems far to easy to me. I have been disappointed in the lack of difficulty. Some decks look like they will have trouble, and the third quest can be very hard on decks, but all in all the game is very simple to win ATM.
I have won 4 2-player games, lost none. Won 1 4 player game, lost none. Won 10 solo games, lost 3. Those 3 include 2 attempts to do the 3rd scenario with a 3 Sphere deck that performs very well in the other 2 scenarios.
I hope that FFG will increase the danger of the quests a lot. Not just in the initial starting of the quest, so far it seems the hardest time that my games have is when we first start on the quest, but as the game goes on. Stage 3 shouldn't feel like I have already won but instead that I'm confronting the true dangers. As the game stands in general I feel like the fighting is mainly to survive the initial game setup and the first 3 turns. After that it is generally pretty smooth sailing.
I hope that FFG will come out with some rules on how we can increase the danger through deck construction of the enemy side. Without it I'm probably just going to start tossing in extra copies of Hill Troll and other nice cards and see how I fair.