Some bugs I seem to get
The muzzleflash of some guns is not where it's supposed to be, instead of being at the end of the barrel, it's on the right, slightly behind the screen but still visible when firing. Guns I noticed this on are the G3a3, the Chinese SMG and the Mac11 among some others.
When holding right click, the G36 will start going to scoped but will get stuck in the middle of the animation. It's only after I release right click that it actually goes to scoped.
Not sure if this is a bug or by design but I find it really annoying. The claymore seems to require 2 clicks to put it down, clicking once does nothing, after 2 clicks he puts it down. This is really annoying when you want to quickly run in the open to place a claymore and retreat.
The gun sounds, sometimes it sounds like someone is shooting right next to you while in fact he's pretty far away. Sometimes I turn around a corner shooting while I actually have to walk for 15 more seconds before I reach the gunfight.