I think Half-life 2 is showing the world that the secret to making realistic looking humans is to go with a "less is better" approach.
The reason why the humans look so good in HL2 is because of strong texturing and good animation. The MGS games are another example of this even with the lower hardware of the PS2.
Just because you have the power to making people look super shiny and plastic, doesn't mean that doing it will make them look better. This plastic model trend really needs to die now that HL2 has been released and people are realizing that it sucks.