I was a fan of these little guys in the days of pre-Unity AI War, but while I was perusing the reference page in my current game I noticed that their number of kills to deaths is poor. I then checked on some of them and I see that they no longer have the old "swarm bonus" they used to get. So even though their raw attack is better (currently 8,16,32 on Marks I,II, and III respectively), they are not performing as well as they used to.
Here's a summary (Built, Killed, Lost, Kills):
Obviously they are going to die often and need to flood a target to kill it as always, but are they working as intended? Or should they get their swarm bonus back? I can add it to the tracker if they are supposed to retain their old bonus or need other possible adjustments?