To get those benefits just use the gamepad
The PDW seems to have the best range, and the biggest mag, MP7 has the least recoil with a wiimote. Regarding killing in 3 bullets, I think thats your conection - takes me about 10 to kill with ANY gun. Hence ALL my guns have a 1.25/1.35 kdr, there is NO standout gun for me - not sure what to make of that.
The Chicom and Skorpian are fine. The Skorpian feels OP when you die by it but it's a hit marker machine at medium to long range. It has short range, low damage, and a fast firerate. Exactly the way an SMG should be.