also your main brick texture, wel the one on the bridgy thing has a very repetitious pattern of brick colour, this more the typre of brick work done on a fancy house or something, builders would not use such for a warehouse and it just looks very repeated instead. id mix them up to make it more random. i also totally agree…
One real big that i see right off the bat is on your brick normals,they seems to be generated in photoshop and using the diffuse as the base to generate them. Try not to do this,i imagine its why your normals look so noisy because they are created using a noisy brick texture. Good normals take time to make and shouldnt…