I'll admit up front that deckbuilding games are not always my strong suit. That said: I do really like this, but I also found it very hard to build a deck, because the card-gaining was slow (and random), but a lot of the cards only work in synergy. Vampires are only useful when you get a cluster of five of them, so taking one vampire card feels like it's just a waste of space until you get one more. Werewolves are only useful when you have vampires...and so on.
Of course, it might just be me.