Not sure if you anti-MB guys don't like it because of the noise or because is looks sissy-boy. I can understand the latter, because it does look quite non-traditional on a hunting rifle. I totally get how that can be a big turn-off.
If it's noise, then I think it depends wildly on the type of break and the caliber it sits on. Like I said, my .30-06 + MB is quieter than any nonMB 300 mag I've heard. If you won't allow my .30-06 into your camp because of noise, then you won't allow anyone to show up with a standard 300 ... which is really odd to me, considering both the popularity and utility of that caliber.
Maybe a mag with a muzzle break is obnoxiously loud. I don't know ... never heard one.
When I go hunting, we don't fire rifles in camp. When we hunt, we scatter across the region doing our own thing, keeping in radio contact should we need each other. I wouldn't care if one of my buddies used a howitzer -- it's 5 miles away from me, so a few extra dbs doesn't affect me one bit. So, I'm not quite sure why you'd care if one of your hunting party used a loud gun. Just curious.
Anyway, I think the OP got good info here. Reduces recoil. Adds to noise. Type of break and type of caliber affects the recoil/noise attributes. Couple of links to good articles on breaks.