These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Vampire Hunter D
Gateway Series: The first movie was one of the first anime movies released outside of Japan.
Growing the Beard: The First novel, quite frankly, actually sorta sucked. D is pretty much a God-Mode Sue, the Unfortunate Implications are pretty bad, and the plot is relatively straightforward. The next ones? Start to focus on world-building, remove some of the more blatant cheats the Nobles used, and it just works.
Vampires as a whole in the first book. One aspect that was thankfully discarded without a trace for later books: they've bred it into humanity that if any human discovers one of their weaknesses (like garlic), they'll automatically forget it - so humans can never get the upper hand.
Streamlined: A pretty good dub in the style of Carl Macek (first movie).
Many fans and critics, however, find it laughable and poorly done.
Squick: Too many to count. One scene in Journey to the Northern Seas ranks pretty high among fans.
Surprisingly Improved Sequel: The first movie is fairly cheesy, and not all that distinguishable from other Gorntastic 80's movies/OVAs of the era once you get down to it. Bloodlust, however, is a lot better at atmosphere and storytelling, and the Schizo Tech of the first movie meshes a lot better here.