I'd rather not call it accurate, especially because ND doesn't seem to aim for it at all.
I still prefer the term 'hyper-real' for this style, where certain aspects of reality are more or less over exaggerated, while others are pushed back.
For example,
asymmetry is almost completely lacking in the UC4 characters, whereas in real life every human face has a lot of it. In fact, when you mirror the face vertically, most people have a "fat" and a "slim" side.
What's even more curious is that in general, we tend to find people with really symmetrical faces to be more attractive. Yet, there are a lot of celebrities with quite obvious asymmetries - and yet they are considered to be extremely handsome. Like, Tom Cruise has teeth that is shifted to one side, but his smile is one of the best, responsible for some huge box office incomes. Or another example is Adam Driver, who's entire face is really mismatched and yet a lot of female viewers of TFA have found him to be extremely nice.
So, the human characters in UC4 are an interesting mix of real life features and idealized representations of humans.
They have realistic skin textures, hair, body proportions and build; but the skin shaders are stylized, the faces are very symmetrical and also somewhat idealized; their clothing is very realistic, they have dirt and grime and wear and tear and sweat and blood, but everything is slightly over the top at the same time.
All of this is a result of very conscious art direction, of course.
It's a common thing nowadays to compare UC4 to Quantum Break - but let's not get into a flame war here

- which is a bit strange to me, as Remedy is obviously aiming for a very different result. They're using a lot of scanning and other types of data acquisition to create their characters, and both the lighting and the post-processing are tuned to mimic the look of TV shows. Which makes a lot of sense, considering the tie-in series. So that title should be more appropriate for this thread, as they are aiming for accurate human rendering - whereas ND is going for their own look, building upon the traditions of the Uncharted series.