Are you setting the materials Diffusion to 'Unlit' and Reflectivity to 'None'? That should be all you need to do get an unlit render like in Max. You won't get the background gradient but you can just add that in Photoshop if you really want it.
It looks like you have viewport shading on which generates artifical shadows on your model. I would recommend working on your model while in a flat-shaded view to really see where you need to improve your textures. Right now, a lot of your materials lack definition. The metal bits need to have more than just a white…