It's subjective, but given the frantic search of a cure for baldness, and the extents to which some people go to conceal it, I'd say it's pretty much unattractive.
People search to "cure" everything they don't like about themselves. In the case of baldness, it only seems frantic because it's elusive. The ED cure use to be frantic until a little blue pill was developed. A lot of people embrace their baldness, so it cannot be objectively negative or unattractive.