As an avid isotropic player, here are my feelings about the pending app.
I'm not bothered by having to pay for it, as long as the price is reasonable (i.e. not the cost of the full physical game plus all the expansions).
I'm not bothered by the possibility of it not including all of the cards at release. I would be very disappointed if it didn't eventually include all of the cards.
What does really worry me is that it will not correctly implement the rules of Dominion. If it's not being programmed, or at least thoroughly tested, by someone who knows the game well, I'm expecting lots of bugs. As a corollary, I'm concerned that when bugs are found, the process for reporting and fixing them will be slow or non-existent.
Donald, can you give any reassurance on this front?