Maybe there is a language barrier involved here, but "outsized" in this context means drones have more of an effect per dollar than conventional techniques. It'

Maybe there is a language barrier involved here, but "outsized" in this context means drones have more of an effect per dollar than conventional techniques. It's talking about how big their impact is--that they can do a huge amount of damage with very little cost. This is congratulatory language, not dismissive. It's acknowledging the serious defense problem that drones pose. You can't rely on an expensive defense against an inexpensive offense.