Brady over at GoHunt has a video or two showing the effects of point of impact and accuracy when using electrical tape to cover a brake. Didn't seem to effect anything, but might check those out if you want. I use electrical tape over the muzzle (brake or no brake) and, like others, haven't noticed a difference in accuracy or point of impact.
As far as brakes go, I guess to each their own. I can understand why a person hunting by themselves would want to track impacts much easier by braking a heavy caliber, taming the recoil so they can see the hit on an animal. I completely understand why some don't like them as well. But, the whole "man card" stuff is a little annoying. On the flipside, could one's man card also get pulled for not being able to take a little extra noise? I really don't care. Shoot how you want to shoot. Do what you feel you need to do to be as accurate as you can be, and have your target die fast.