I suppose it really depends on what Harley engine we are talking about. The Sportster and B model engines with balance shafts aren't that bad. Of course there is also the V-Rod engine, but that was done by Porsche. The worst vibration-wise is the A model engine, but it is not that bad either. None of the new engine leak or do anything that Harley has a reputation for in the '80's and early '70's.
I agree about the fit and finish, as well as about the marketing.
I think the only real dig you can take at Harley these days is with regard to the weight of their bikes and their components, but that really all come back to the marketing thing. If your design intent is to generally project the nostalgic Harley style without any reliability issues, then why blow a bunch of your budget revinventing the wheel. If you do provide lighter parts and higher performance, it might actually hurt your sales figures. It's interesting as it is a market that is quite different than most other in the vehicle genre.
Of course if you still want Harley style, in a more progressively engineered package, you can always buy a Buell. :wink: