I was just about to post that. But I find they exaggerated a little. I took that diffuse map (just for a test), brought it into Crazybump, and got a result that is very similar to the Zbrush normal map. The difference is, I couldn't get the same crisp lines between each rocks, which is pretty normal, but the crazybump…
That Uncharteed 2 pic should say it all :) I'm not sure I'd say you can't get photorealistic results with modeled textures either... That is up to the artist and ofcourse the style of the project. But basically the control you have over creating the model yourself versus clone-tooling photos makes it the way to go if you…