Fine, here's my thoughts on Quiet. She's an absolutely terrible character. She's on part with the Beauty and the Beast group from MGS4. Not having her talk is whatever, it fit her character although her motives were questionable in the end.
Every time I was in that chopper looking through my menus, I was really annoyed that Quiet was always shoving her butt and boobs in my face. Her attempted rape/death scene could have been okay if her shirt wasn't popping open and zooming in on her chest while this is happening. Same for the torture scene.
Her explanation for why she needs to be almost naked makes no sense either. The End has the literally exact same thing going on with him. He wears a full ghillie suit, and he can breath just fine. He couldn't shoot grenades out of the air though, so I'll give her that.
Her being in love with Venom made no real sense either. I get that they wanted some kind of love interest for the game, but her love seemed to come out of nowhere considering Venom said like maybe 2 lines total to her.
Its obvious Kojima just wanted her to be a fanservice character. And while that's kind of annoying, I would not have minded nearly as much if he wasn't such a liar about it.
Saying we'll be ashamed of our words when we hear her backstory, which makes no sense.
In conclusion, D-Dog is the best companion.