they def are weak.
I had a fun encounter the other day. Settlement wanted supermutants killed in order to join Minutemen. Its north. I run up, and pull out my .308 combat sniper rifle. I am a bit too far away, shots aren't landing. As I pack up and start to run closer, a vertibird comes in from the north, on the other side , dropping some BOS troops, and attacking the mutants. I loose line of sight, due to a fence and hill, so need to run around, to get los to start sniping again. By the time I am set, the vertibird goes down, I think IT exploding killed both paladins in powerarmor, possibly a suicider mutant as well. But both PA BOS paladins died too. I kill off the mutants, who all won the BOS VS Mutant fight. I grab some loot from the mutants, then collect BOS tags and some loot. As I, enter the buildings to get the rest of the loot, I come under fire from a minigun, and can hear another vertibird. At first I thought, another BOS?, and why the hell are they attacking me again? (had a BOS patrol aggro to me the day prior for unknown reasons. Seriously, I fast traveled to a place, and they were attacking me as soon as I loaded.) Dive for cover, heal up. and then engage when ready. Its Gunners in a Vertibird. I snipe the guy manning the minigun. Try to snipe the pilot. but I guess it won't let you? forces you to target the bird itself.
But then seriously. 5 shots was enough to down it. double shot .308 combat rifle 5/5 rifleman. Didnt even need to sneak attack it.
Funny part was I totally died 3 times, and had to quickload to avoid it crashing INTO me and killing me. the house I was in only had 1 exit, and the house itself was not protecting me. had to run TOWARDS it, to avoid it.