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.
Baldness is something negative, it makes you less attractive. Like being fat, or having big ears, or being short. And? Should we change that? How? Should women be with bald men out of pity even if they are not attracted to them? All of this sounds ridiculous.