Indentation - yep, seems like effects of planar/box mapping. Indented surfaces have not enough uv space. Quick comparison to highlight the problem:
://i.imgur/njR8X0c.png
Second one is not final unwrap, it should be rescaled and etc, but I think you got the idea
Quality - Your model is 3.5m and you have planar mapping inside 0-1 UV cell so 2k texture is scaled to this size. Also it could be just a bad texture, looks like photo to normal to me.
For example - this is single upscaled 1k texture, so it’s more like 512px per meter 
No detail textures or any additional stuff
://i.imgur/KRJFgPZ.png
If you want to use this piece without tiling basic texture at all - you probably need either to use texture with higher quality(I’m not talking about size) or use detail textures