This is a sticky wicket Thomas. Technically, mandatory HOA dues should make it a PUD. However, I've been round and around with builders, lenders, underwriters and even the VA on this topic for years. Usually, it ends up being a PUD, but there have been instances where the non-PUD side of the argument has won as well (even on VA cases).
In those areas, specific neighborhoods that is, I have stopped marking PUD because of past weeks/months of arguing among the parties that was eventually settled with "it isn't a PUD". I've sent in numerous ones in these areas since the original arguments, not marked as PUD, and have gotten no further grief.
The short answer is, there are apparently mandatory-dues subdivisions out there that are not PUD. The long answer is, in my experience, those non-PUD subdivisions that indeed have mandatory dues typically have ultra low dues (<$50 per year) and those dues are for nothing more than mowing the grass around and repainting the entryway sign every year.
I rue every assigment I get that has mandatory dues, that is a new subdivision (not rare around here) when the developer immediately states "THIS IS NOT A PUD" even though the dues are high (say $100 a month) and covers more than just cosmetic upkeep of the entryway. I know that I am going to mark the PUD box, and spend hours on the phone with everyone from the buyer, builder, developer, lender, lender's underwriter and even the Atlanta VA RLC...so I give the party line/definition (mandatory dues = PUD) and let the higher ups argue it out, and mark it however it is the highest of the higher ups in the argument says to mark it - which in my case, is usually the Dept of VA or the local HUD/FHA rep. It's their guarantee, so let them worry about it - is my defense. I qouted the book, made my case, that's all I can do.