Played a bit of Rad Soldiers, up to level 9, it's quite good indeed. But I don't like all the coin stuff, it doesn't feel right to be able and acquire weapons and troops in such a way, it doesn't seem balanced like, for example, X-COM tech research that unlocks new weapons, especially since this is mostly multiplayer with botmatch-like challenge levels on top, plus the good stuff are all too expensive pushing you to buy them with money. The interface for that needs work too, unless I missed the compare to currently equipped option. But yeah, add a proper campaign and I'd pay for it, like I plan to do for Warhammer.
Oh, it also looks very nice and yet doesn't kill the iPad2 battery like some other good looking games (recent Sky Gamblers).