>polygon look
It's funny when you consider how technically the Build engine doesn't actually render polygons/3D at all. This might not be true on consoles though since the Saturn version at least was remade with a Powerslave/Exhumed engine (which was true 3D).
Speaking about that, I wholly recommend you to play the console port of Powerslave (NOT the DOS one, it's a different game altogether). It's a really great FPS that was a bit similar to Metroid Prime with the non-linearity thing. In 1996.