So, out of morbid curiosity, I listened to Skull Face's ten-minute-long-ass "What do you see?" Joker-esque speech from GZ... and while it the tape itself didn't have anything super incriminating in it other than like, I don't know, basic torture (I think a guy gets waterboarded or something) — like something else I can't stomach to watch — I have a few things to say about it.
1. This man is gaslight and gatekeep. Like Jesus fucking Christ, the amount of forced empathy under false pretenses he postures having for the sake of either gathering information or for the sake of luring his interogees (?) into a false sense of security, is honestly a little astounding. (Which, in itself, isn't necessarily something foreign to his character, hence his proclamation of "I don't want to do this. I'd rather not have to ring the bell," when interrogating Code Talker.) I would say he is two-faced, but he regularly accentuates that he doesn't have one. So it would be disingenuous to draw such a comparison.
2. The voice acting really isn't as good as the voice acting James Horan provided in the sequel, "Metal Gear Solid V: The Phantom Pain." Like, in the tape I cherry-picked to watch, it's not... terrible? But if I said it wasn't leagues below Mr. Horan's performance in the latter release, I would of course be lying. Skull Face simply sounds more menacing in the latter, despite the much more mature tone of "Ground Zeroes" in comparison. Which is strange, since "The Phantom Pain"'s depiction of Skull Face is easily the more comical, and unserious of the two. I also find it off-putting because he sounds so much younger in that one, LOL, which I suppose makes sense, given that the tapes take place around 1977-1978... ish?
I will say one thing about Skull Face's design in "Ground Zeroes," however: I like him without the mask. Very off-putting and disturbing in appearance, likely befitting of the... *cough* tone, of that game... or lack thereof. Other than that, I don't really have much to say about it.