The Locusts are swarming, but at least the Knights havent had a problem avoiding it (or finding it) since the arena changes, consistantly during my play times.
I think the Hordes offer something that many want to experience at least once if not during their whole evening of play. I think it would help if we could add other things/missions on the side of the "hordes" to offer tempting rewards to players looking for some reaction to their action on the other team. Hordes are kind of an instant mindless form of this, head to the flame, shoot down two bad guys before being shot down yourself, and bam, you feel rewarded.