Its a slowdown method - if something with swords for arms is up in a target's face, there is a good chance they want to shoot that first, and as Crunch states, its a good way to make them deal with penalties... especially if you have a rotodrone with a mounted sniper rifle and APDS. (I've decided that yes drones are squishy, but this means that rather than deciding they're worthless, I just have to think tactically about them - a flying drone with a sniper rifle and armor piercing rounds is a great complement to a fighting force, and a steel lynx makes for a fairly heavy support weapon when you take advantage of that heavy weapon mount that comes standard.) Secondly, you might be able to talk to your GM - with the right programming skills, you ought to be able to give it a nice software upgrade and improve the offensive capabilities of your drones.