Not sure it matters.
Two things will happen when I make a character with a custom face:
-Something that looked good in the editor will look terrible in cutscenes, and I'll find a good looking helmet or gas mask to hide my mistake.
-My character's face will look great, but there's no stat bonus for going helmetless. Therefore, I have to fight the urge to leave my character's head bare, and I usually give in.
So, Bungie, hope whoever you have working on custom armor can do a schnazzy set of gas masks.
Complete thread:
- Facial Customization - 
option2401, 
2013-03-13, 19:18 
- Facial Customization - ZackDark, 2013-03-13, 19:24
 - Facial Customization - rliebherr, 2013-03-13, 19:29
 - IGN article - 
Xenos, 
2013-03-13, 20:28
- IGN article - 
TDSpiral, 
2013-03-13, 21:33
- IGN article - 
Dagoonite, 
2013-03-13, 21:49
- IGN article - 
NsU Soldier, 
2013-03-13, 23:32
- IGN article - Dagoonite, 2013-03-14, 00:54
 
 - IGN article - 
GauntMkII, 
2013-03-14, 04:27
- IGN article - option2401, 2013-03-14, 09:13
 
 
 - IGN article - 
NsU Soldier, 
2013-03-13, 23:32
 
 - IGN article - 
Dagoonite, 
2013-03-13, 21:49
 
 - IGN article - 
TDSpiral, 
2013-03-13, 21:33
 - Facial Customization - narcogen, 2013-03-15, 03:49
 - Not sure it matters. - 
Quirel, 
2013-03-17, 20:02
- Not sure it matters. - Ragashingo, 2013-03-18, 00:07
 - Plastic Surgery - RC, 2013-03-18, 11:35
 - Not sure it matters. - Quirel, 2013-03-19, 14:29