2/3 quest rewards were cards

That's not bad. I need more cards, so whatever... it's easier to get the cards than it is to buy them, even if they're not the best cards in the world.

As for the DEC, it'd be nice if there were a zero or several after the 12, but again... we can't all get lucky, or luck wouldn't really exist. If we all got lucky every time, we'd be disappointed we didn't get something extraordinarily lucky.

Neutral quest bad

Not really. They're okay, but I do tend to struggle without things like the Furious Chicken card. Everyone uses those, or at least a lot of people do, so even though they seem like they're not really worth that much, it can give your opponent just enough of an edge to beat you.