Have same issue here, I've switched to an axe/torch ranger with a decent aoe, I managed to get _some_ kills (got some drops), but with so many people zerging, apparently I never get enough participation (2nd phase was over even before I could get to one of the spawn points...). I don't have all the mounts unlocked so I can't move quickly between places...
Getting the Hologram Herder achievement seems impossible...