If your materials have been setup with PBR in mind, then you shouldn't change the material parameters to compensate for lighting.Either your lighting is too bright, or you simply need to stop down the whole image in post (reduce exposure).
Remember, if you photograph a bright wall in sunlight next to a shadow, you need to choose what part of the image you are exposing for. Either your bright parts will blow out, or your shadows will be dark. Well, that is if you are aiming for realism. If not, then break the rules and have both areas exposed 'to the eye' and mess with the materials all you want.