I freaking love this game, and I'm 50+ plays in. One of my few gripes though (and I'm just nitpicking/looking for discussion) is the Obligation cards. They're a great concept - I like how they're similar to the weakness cards from Arkham, but they're in the encounter deck instead.
But I think it's a shame that they're less thematic than the Arkham ones, they have much narrower design space and some of them feel less specific to each hero.
My main problem is that in almost every situation, the first bullet point (Exhaust alter-ego > remove the obligation from the game) is almost always the better choice. I feel like the intent of the cards is to make the player have to make a difficult choice, but in practice it doesn't play out this way. And the first option is made better by the fact that the obligation is removed from the game, so you don't have to worry about it again.
I wonder if simply putting the 'remove from the game' clause in the 2nd bullet point would have made them a bit more agonising.
I just find that in play the cost of the first bullet point is to miss out on a basic power and that's it. Whereas the 2nd bullet point is always a bigger cost and the card is still in the game.