Whenever this subject is mentioned, people always bring up these same two arguments, and most of them are just repeating what they heard, having never tried shooting a compensated gun in the dark or practiced weapon retention techniques.
I have shot them in the dark, and it's very much dependent on the ammo you choose. It hasn't been hard for me to find 9mm and .45 rounds without that much flash. In addition, as someone said, you shouldn't be shooting in complete darkness anyway, if you're identifying your target.
As far as the gasses in the face thing is concerned, I haven't practiced shooting compensated guns close to my face, but even if the remote possibility of such a thing were to happen, I doubt you'd even notice it in the heat of battle, and a few powder burns would be worth saving your life.
That being said, I don't notice any particular advantage to compensated guns either. I have an S&W 625 with a removable compensator, and I honestly don't notice much of a difference, so I leave it off. The only exception I know of is my Marvel .22 1911 conversion, in which the compensator's ports and additional weight eliminate *all* muzzle flip.
I wouldn't buy a ported or compensated gun for a carry weapon, but if it was what I had, I wouldn't hesitate to use it.