Sounds could be better, but aren't bad by any means.
I will agree that every gun in the game not using the rear sight annoys the crap out of me. Some guns it isn't so bad on, but the Tac AR and auto shotty are the worst. It might be a "design decision" due to the rng on accuracy, bu it still looks bad. And from what I've seen adding in new weapons, the camera has an odd angle to it when aiming down sights, making it an absolute pain to line up the sights. Which makes me wonder if it was just easier to design all the new weapons without rear sights, rather than address the camera instead...