Might just be me, but I think it looks fine, but if you are going to do the scratches like that, I would make sure they are all like that,
That way it looks intentional
Here is a link for Samples of a Bunch of Rusted metal and peeling paint, due to weathering,
It was the closest thing that I could think of for a reference,
Hope it helps
http://www.mayang.com/textures/Metal/html/Flat%20Metal%20Textures/