I'm guessing none of you are familiar with the 'drone from hell' phenomonah, visible in the Alien movies and pretty much every Aliens game ever made.
In alien, we see a drone from hell. It wipes out the entire crew of the Nostromo save Ripley and the cat, and manges to magically figure out not only that the narcissus was an escape pod, but that moving to it when the ship is about to nuke is a good idea.
In aliens, there are no drones from hell - they all just get slaughtered.
A3 features a drone from hell, wiping out nearly an entire prison colony , and continuing to try to kill people after being covered in molten lead.
A:R features a few normal drones who get killed in standard operation, and several drones from hell - as is evidenced by the fact that they wipe out an entire millitary base, and are only killed in the end when the ship crashes into earth.
AvP1 has thousands of aliens slaughtered wholesale, and one drone capable of getting all the way from an alien world to earth, slaughtering everything in it's wake.
AvP2, again, sees hundreds of aliens cut down. Yet a single drone is capable of killing battalions of soldiers, overrunning the POC by itself, killing at least 3 predators (actually maybe 4 or 5, been a while since I played the whole way through), and rescuing the abducted empress despite having to go through legions of synth troops with miniguns and 2 predators.
All things considered, a single drone killing multiple preds while thousands of other drones die without blinking is nothing new. It's standard issue for the series.