I like to consider myself as a bit of an expert when it comes to using Navisworks. I've been using it almost every day for over seven years, you tend to know it inside out in that time. Occasionally however you find something out where you kick yourself for never having tried something out, that moment happened on THEbar, the 'genius bar' of Autodesk experts at Autodesk University 2012 where one of my colleagues pointed out this tip.
In your normal viewing mode, how do you get from this: -
It's fair to say that it does make models look more appealing!
Here's how to do it, open Options (F12) and Interface > Display, switch off Auto-Select and change the system from Presenter to Autodesk
Then go into Interface > Display > Autodesk in the options.
Switch on Screen Space Ambient Occlusion, change Shader Style to Phong (there are other options), and change the Multi Sample Anti Aliasing (MSAA) Level to '4x', higher will significantly affect performance.
Obviously this view isn't for everyone, and may not have the same performance on larger models, but it may help in reviews where you are looking for management buy in.