Metal shader way too dark What am I doing wrong? I have tried twice with this specific pbr, it comes out super dark. Am I missing something?
I have tried to make completely serperate textures as well, with the same result. Is it the object, the lighting (everything else is lit fine)?
pbr shaders need an environment to look more properly. It's one of the key parts in physical based rendering method.
Here is a metal shader under different environments:

to the left we have no environment (black), blender jungle in the middle and blender default room environment in the right.
A quick fix for this would be to add a good environment texture that matches your presentation of the area or comes close to it.
you can start looking for one here: https://hdrihaven.com/