Everyone is just starting, but my fiancee has a nightwing/batgirl team attack deck that is 6-1 against the two decks I have thrown against it. One is a strength/special midrange deck based around a bunch of rank 7's and the other is a strength/special aggro deck all round 5 stat and less (plus two flashes since that is what I have so far). My favorite combo with that deck is most definitely Power Corrupts and 1/1/1 battle card letting you get in a guaranteed hit and giving you back your battlecard for use later. Also, robin is pretty good on the play as he draws you a card on turn 1. And flash turn 1 is fun too with the 1/1/1 battle card since there is really no downside to it and you start with a VP.
A friend though is building something similar to by midrange deck except he already has 2 last son's of krypton.