If you put Quickdraw on the KSG the amount of BS moments drastically goes down. I use it a lot (with Quickdraw, Laser, and Long Barrel) and there are hardly ever times when I think I should have hit but I didn't.
9/10 times its because I actually missed or just lag, not because of the functional ADS delay or some other type of shenanigan.
Plus I've gotten pretty good at getting long range headshots with it, which are like mini-orgasms. I can only imagine their frustration/incredulity when they watch the killcam.
F2000 was an unholy weapon. Respect it, and it harvested souls for you. Treat it like the mortal SCAR-H, and it would devour you.