There are a few refinements that could be made to aero; making everything look flat and ugly isn't one of them.
Also... for the love of computing get that supid ribbon out of Windows Explorer. It hasn't really been popular in MS Office, why would people want it in a file browser? To put this critizism in perspective, I remember reading somewhere Microsoft considered adding the ribbon to Internet Explorer 7. They decided against it, believing the ribbon is good for "commanding", while IE is used for "browsing".