I shouldn't have phrased it the way I did. I wasn't considering a factory installed one. I do mostly BR and bolt gun builds but since it was alluded to earlier that I may relating my posts more to the semi-auto guns, I wouldn't say that.Yes I do agree, there is definitely a difference in brakes. Most of the ones I have been around on factory guns are not much next to the custom brakes.(example) My friend bought a Kimber with a brake, pretty much a pipe nipple with holes. Our smith built him one that is baffled ,no comparison .The Kimber brake did not come remotely close to reducing recoil.
But, I have literally seen AK rifles threaded at the muzzle that only had threads about 1/2 way around!! Not sure how they are tooled up that even makes that possible, but it was. There was no bullet strike but it was junk and the brake suffered from the huge exit hole and brake design with very little sail area...IMO. So yes, I agree that there are certainly some examples of very poorly working brakes.
Savage use to offer one on factory guns that was good example. They could be turned on and off but it wasn't a good brake, at all. Still, it made a very noticeable difference