Hey Random,
the door blocking is not only common among less-lethal players i would say. People tend to do it, simply because its working. I agree its unrealistic - as are doors, opening in two directions...
Most annoying tactic for me:
Excessive use of Opti device.
Just get this pic: There are 5-6 well equiped officers. Maybe with less-lethal or lethal guns, doesn't matter. And one guy is sitting there one minute staring in the room with the mirror - on every single door. I mean why? You probably have 1-2 bangs or gas for every room on the map.
Opti use at neuralgic spots is okay for me. But please not on each and every door! Or maybe even multiple times at the same door! Please no.
Greetings