The game is a waste of time if you play it free, I'm league 9, gathered 900k bucks over a week of intense playing and got 1 useless blue card...
I can't say how is if you're spending money because I haven't spent any.
They have an ugly bug, except for Polly all other girls have missing cards and can't be fully upgraded, since you can't get a citizen card from the store, even the gold box doesn't have citizen cards.
The images are pretty cool. Many cards have only one or two combo images.
It looks like they are in a hurry to cash money before finalizing the game.