If you're looking only for score/electrum, just sell the useless cards and build a recommended deck from the official forums. Makes early grinding much easier.
Still needs a "challenge a friend" feature, even if it doesn't count for leaderboard purposes. If I want to play against a friend, we need to time the queue enter time and hope we get matched together.
Gold is valued more and is produced less to encourage peoples to play this as a RTS game, instead of a babysitting, since the main gold income is through battling.
@masternjs and what should be the point of having 4 different buildings for resources, then? Just have one and tell how much you want to produce in each. Still a bad suggestion.