Any Harley is a decent beginner bike. They are aimed at the lowest common denominator of riders, so that even the marginally competent can squire one around and look the part. That is one reason they are able to sell so many bikes to the clueless. They have a low center of gravity and modest, torquey performance that is not too particular about gear selection and will not tempt you in over your head.
One downside to learning to ride on a Harley is that a minor biff is likely to be expensive if you want to keep all that pretty paint and chrome looking good. Good for the Motor Company and its dealers, bad for you.
Another is that the bike's limitations prevent you from becoming a really good rider. The small minority of Harley riders who can really ride a motorcycle probably learned to ride on something else, and probably have another bike or six in their stable. Of course, if the Harley experience is all you want from motorcycling, none of that makes any difference.
