Usually I'd agree but CoD has weird quirks that it's useful to know, for example putting the red dot sight on the AK74 in CoD 4 reduces the damage, it's still like that to this day. Not really exploits, just things it's useful to know about.
when using akimbo pistols, fire all bullets from the right hand pistol except one. Then press both fire buttons along with the swap weapon button, all at the same time. The left pistol will fire fully automatic at it's maximum fire cap. Works best with the Five-Seven as it has large mags and one of the highest fire caps.
no that's exploits.