For now, I had like 5 attacks, maybe 6... I only get 3 deathclaws each time, no more, no less.
Each time, they killed on their way. Sometimes just 1 person, sometimes 6 (the first time).
The fact that dwellers run around like headless chicken when there is an attack doesn't help to heal them. They go 2, 3 on superposition, and I can't heal them all (also, the update brought a bug to select dwellers on iOS, so it is even more difficult because of this)
I understand that some people that had better luck with the weapons they have found got better chance against the Deathclaws. Unfortunately, we aren't all playing for weeks/months and we don't have the same gears, and didn't had the time to level up all dwellers to 10 in each stats and to level 50...
So to some of us, the Deathclaws are like a fun manageable encounter, and to others, they are a deal breaker. I am still playing, but I play less, since now I tried to collect everything, make a few change quickly, and quit.
Before, I would play for hours. While doing other things, the game would be open on y phone, and I'll take care of the vault by time to time. Now this look like a bad idea, since the more I play the more attacks I get.