Why does my material look so bad when I apply a material?

I blieve the issue is our uvmapping, You need to unwrap your model in the 0-1 space or break apart the model into multiple UDIM squares, but it cannot be just box mapped as it appears to be in the 2d view.  Google up : " how to unwrap uv model in (insert your 3d software)" this will resolve your issues -jonathan