As of right now with the exception of Mutagen formula, the heroes that are in the pipeline are more powerful than the villains we currently have to play with, expert doesn't feel like an expert it feels like normal at this point and I might be in the minority on this but if you take some inspiration from games like Arkham Horror that have four difficulty levels built into the game, there has got to be some happy medium outside of community content to make this game harder.
I'm only saying this because I truly love the game and I want this to be a game that is played for years to come, but with my playgroup it's getting stale more quickly because of the fact that the challenge is not there. Or there is very little challenge.
So please consider on adding something extra to the game to make it more difficult for those other people that have tons of lcg or card game experience.