All SMGs(apart from the one slower shooting of which I can’t recall the name) have poor accuracy when autofiring. The KEK is in that respect no exception, yet it’s firepower in close combat is VASTLY superior to any other similar gun(it also pretty easily outfires assault rifles in close quarter combat).
I’ve literally come to the point that I trash any other cards if there’s one with a KEK alternative(phoenix, phantom proxy etc). I personally don’t think it’s particularly OP, and I think SMGs should generally be capable of outshooting other weapons up close(especially assault rifles) - but the other SMGs are most lacking when it comes to that. I hope other SMGs will be buffed at one point so they can also pack a punch in close range - and not have the KEK being the only truly viable option.