I definitely understand what you mean!
The colors look less intense and there seems to be a little weak white layer over everything! I can see the difference, yep!
BUT: The white layers are actually the way it has to look like. Take a look at reality The colors are not all very intense and bright all the time! There are reflections and shadows on objects, which alter the colors.
In my opinion very nice shaders look much more realistic because all objects are not as "clean and intensely saturated" as with nice shaders. Very nice shaders provide a little more dirtier and plastic look of these objects. They look far more real and three-dimensional than on nice shaders.
Just take a look around in your room and name me objects which have very intense and highly saturated colors from your current viewpoint. I bet you won't be all too successful.

From very close observation and with some extra bright light these objects look different of course and colors are more intense. But this is not the situation we are in right now, as you have to look at everything from your very own local and current viewpoint. "Everything is relative!"
All in all, more saturation is doesn't not always mean more realism
