Small bit of feedback-- Especially in coop, getting insta-killed by a door being kicked does not feel good
From the realism perspective, in a game where getting double tapped by 5.56 NATO rounds is a survivable thing, being in the path of an door flying off of its hinges shouldn't be an instant death.
From a gameplay perspective, instant door deaths are untelegraphed, provide no opportunity for counter play, and given the claustrophobic nature of the maps, altogether unavoidable (especially in coop bot matches). This mechanic just feels bad and is right up there with getting hit from a molotov thrown from 500+ yards away by a bot who just so happens to know you're prone in a room with no direct line of sight.
I'm all kick-in-the-door style adventures, but I think some kind of knockback or stun would be a little more appropriate****
(that is, unless it's established that security and the insurgents NEVER skip leg day and can leg press a train, then I'd buy that they'd be able to Sparta-kick anyone to death with a single blow)
****As someone familiar with games development and UE4, I say this full well knowing that designing, implementing, and balancing a new player state is, to say the least, not an easy task to do. Whatever the fix is, I'd like to mostly just point out that as a player, instant deaths to door kicks are not fun to play against