Yeah, Esh, I definitely found that the card mini-games determined how effective the attack/defense was. I stopped putting a couple of cards in my deck all together because I could never hit that fucking fly with the fly-swatter!
And even though this game was a bit easy (I finished it in 2 days), overall I really liked it! If they come out with "Drone Tactics 2", and make more challenging, with 4 person wi-fi multiplay, they will have one of the best rpg games on the DS. BTW, the customization of the drones is one of it's best features!