I've not gotten to play this game yet as I can't go cross-country fro conventions (and I'm DYING for this game to get a pre-order link!!!)... I was just looking at the card previews on the game's page.

Is it just me, or is The Riddler HIGHLY over-powered?! He only costs 3 to get in his deck, and his power allows you to pay 3 to get whatever the top card of the main deck is, and do that as often as you like! Doesn't matter if the next card cost 5 or more.. you get it for THREE! Wicked!