I think RAGE is a bit old for making it look real, also, i'we been analysing the system of the gta 5 ai, mostly because i want to recreate Euphoria, wich is used by Gta 5. So basically, they didnt use any complex materials, because it would take too much data for a game, so they mostly used base color textures, and because the city was modelled in (around) 2013, the models arent high quality. For me Source engine looks real (notedly the LEft4Dead branch), here is why: they used Ray Tracing (baked) wich can make any game look realistic, also they added a noise shader to the shadows wich (i think looks very real) looks like how i see in the dark, also they give the characters expressions with shapekeys, and the physics: Havok does it well. Also the animations should look real, even if your model is poor the animation can make it look real, here is an example: