Also nothing to do with realism:
Smooth surfaces look good because you can see all important details in them, and you can still have a fair amount of shinyness - but it also highly depends on the model. Generally, the smoother the object is, the more extreme lighting can be applied and still look good.
On very boxy models like the Herc I intense lighting looks absolutely bad because it a) kills off the little bit of detail (mind you: not much) it has from the textures and b) creates ugly edges unless you use 10x+ Antialiasing
I rather prefer having a smooth 256 shades transistion instead of a practically 2 coloured model (white-black). If that's your personal taste it's okay, and certainly explains your obsession with insane contrasts in your images

- but I daresay it's not what most people would want to see (at least I don't).