I don't feel like I have issues aiming with my mouse. Sometimes my crosshair feels off from where it should be when I flick, it was far worse in the Beta.
The problem that I'm having is that inputs seemed to get ignored constantly. I now spam keys over and over to make sure they actually get recognized. I don't know how many times I've shot the ground trying to throw an ammo box out. There's just a lot of hidden cool-downs built into the game I've noticed. When you slide, you get slowed down so much at the end of it, and it feels very awkward.
I don't think it's the server tick rate, but some personal delay on all your actions. There's also a weird stuttering when firing full auto weapons, like It's tied to something that it shouldn't be. When playing Overwatch, which had servers that were only 20hz I believe, actions on your own screen/perspective never felt off or delayed. You might die slightly behind cover, but that pretty much happens in all games.
I still think they may have given up too much to get these big player counts. The problem is I really do enjoy it now though lol.