Just cosmetic imho, and it won't affect function. If it was purchased as new, I'd want the dealer to swap me out one with a better finish...I'd have done that in the store though. Now that you have it home, if the dealer isn't normally dealing with you they may be sceptical that you've damaged the finish and it wasn't a factory issue at all.
...sweat can't do that to the finish, strong solvents might.