@wongcung It's not like Hemlock has been the same since S1 lol, it got buffed several times, the only issue with that gun is the headshot damage in burst fire. So a nerf was needed, but devs did the wrong one lol.
As for the Mastiff, it's a must-have weapon to win a game and for now there is not another gun at the same level(apart from PK but it's a Care Package weapon). Imo it needed a little nerf too but they should also make it more consistent as sometimes you can deal 14 damage with a very close shot and then hit for a 50 almost mid range.
Buffing/nerfing is need to keep the game somewhat balanced.
As for the issues you mentioned above, just give up on them, they will never fix audio or servers, they proved it at S7 launch when they said they fixed audio and then basically it was the same as ever.