I don't know about a concensus but I'll throw in mu two cents !
In 2004 I bought a Taurus model 455 , 45 acp , 5 shot , 2 inch ported barrel , fixed sights , stainless steel . A primo big bore belly gun ... self defense is it's only aim in life .
I like the porting ...of all the 45 acp's 1911 the 455 recoils the least , is the easiest to shoot quickly and I can shoot it more accurately than my target grade Colt Gold Cup Match pistol .
The holes like to get together on the target ... it's spooky how accurate this gun shoots ... my Gold Cup is jealous ! When shooting I don't notice any difference in loudness but do notice less recoil . J-frame sized , 5 shots of 45 acp , loads with full moon clips , fits in a pocket ...
for me it's about as perfect a self-defense gun as I've found . I shoot a lot of cast bullet loads and the ports pick up some grunge but clean right up .
My vote ...the ports aren't a problem and may be a boon to reduced recoil / controlled shooting / good accuracy . I don't remember any muzzle flash even on dim indoor range ...could be a ported 45 acp just doesn't have a big flash like a 44 Magnum but my experience shows muzzle flash is a non problem with ported 45 acp .
I can tell you from experience ...during a gunfight time slows and the shots sound far away and muffeled . I'm not going to worry about my hearing ...just staying alive .
Gary