I haven't played the game, yet I read its plot to see if it was good. It seems to, but it really revolves more around Ada than the C-virus.
A woman's and a scientist's obsession with the image of a woman (whom the public seem to appreciate). I think the developers were actually obsessed with her, to the point that the story fell to this. I don't hate Ada, but her mystery is what makes her likeable (RE 6 is like a revolving door with she as the axis). Ada is the mystery dot in a game of horror, not the horror in a game of mystery. Even my sentence doesn't describe well RE 6.