Are there any cards that you have had to really think about how it plays or had discusions over how it actually plays ?
I had a bit of debate with another player over salvation (not during a game but in a general discussion) and if you still got a face up damage card because the Crits count as two damage. In my view you would still get a face up damage card as salvation is not triggered by a crit affect and therefore the fact you have a crit icon will allow you to trigger a face up damage card.
The other cards we had to think around were the cards with crit activations in which the crit effect was damage or dealt cards ( APT and ACM etc) we all agreed that as activating a crit effect did not spend a dice, the crit icon still caused its normal damage after the crit effect had been activated (so a black crit/hit dice activating APT would cause one face up crit and two standards damage).