I have been playing Halo since Halo CE, Halo 2 was my first time ever personally owning a Halo game and Halo 3 was the first game I got to have on launch. I have even played Halo Reach, Halo 4 and Halo 5 (which is my favorite MP with Halo 3 being my 2nd most favorite).
I have been playing Halo MCC Halo 3 BTB almost exclusively while playing MCC and have a few gripes about the game (and can’t recall if this was an issue for other Halos).
The title says it: when shot or taking some damage (that doesn’t move you like an explosion or collision) you are forced out of crouch.
I personally really hate not being able to stay in crouch while being shot, I find it often takes away my freedom of movement choice and can get me killed. I really hope Halo I will not have this as a thing. I do not want to be de-crouched just because I got shot. I don’t mind dying in crouch if it is my choice.