Kerris, Nerfing a Drone Rigger Options

[Kerris]

I recently started a SR4 campaign, and am slowly learning how to effectively run this game (so it's fun for everyone involved). However, one of the major fun detractors is that one of the characters is a drone rigger who has four combat drones. Since his drones get 3 initiative passes, a large part of the combat turn is spent rolling attacks for these drones, and combat is very slow. Also, his drones, of course, have Very Large Guns mounted on them (Ingram White Knights, to be specific). The lackeys I've been throwing at them can't stand up to that (and some of the harder foes can't either). This makes combat even less fun for everybody else, since they shoot at a couple guys, they miss, and then the guys are dead (or at least mortally wounded and pulling themselves into cover) due to these drones.

So, my question is this: Should I limit his drone usage out of game? Or should I continue to attempt to take out his drones in-game? Do you guys have any tactics against flying drones with large guns that might be useful?