1) Everytime the player fires grenade launcher, he is forced to reload it & can't switch back to normal firing mode instantly (not until the reload for the launcher attachment is done) .. Same for Shotgun attachment. I haven't seen single Shooter in my life with such moronic stuff. This can be a real pain in some cases.
2) The Sensitivity for the ACOG Scope is extremely high. It's so high that it just results terrible precision & forces me to stick to Reflex Sigh or DSG sniper. It's Sensitivity should be similar to Sniper Score or Reflex Sight. Anyone who prefers low default sensitivity for precision aiming would find this frustrating.