Yeah, there's times I swear I play a different game. I have no idea how "my 4th level party of 4 dealt over 100 points of damage against a flying AC 23 "boss" in under 2 rounds." happens. I mean, I'm not doubting it happened to @Jefe Bergenstein but it seems like it would require a lot luck (including multiple crits), cheesy builds and likely a lot of magic items.i mean, that's just completely and blatantly outside the parameters of the scenario, then. also you used your bonus action twice.
how in the HELL did they manage THAT?
All I can say is that based on DMing for and playing with multiple groups, it's unusual.