The bar across the top showing the visible cards and number of cards is too dim. I play on my computer hooked to my TV and in full screen, and I find it too difficult to see what is going on up there. Its greyed out like an inactive button, but seems to dim to be efficiently be displaying the information its up there to show.
+1 here too, totally in agreement. I know you can right-click on the cards and everything but I really wish it was easier just to tell at a glance what's in your opponent's hand.