I saw NoDS for the first time in 1991, when TBS ran HoDS and NoDS one Sunday morning to coincide with the Revival series on NBC. I was completely confused by NoDS: still developing my DS trivia, I had labored under the impression that Quentin was a werewolf and that Angelique was in love with Barnabas. I recall being bored silly by the time Tracy finally got hers at the film's finale, and still confused (but mostly bored). Years later, however, as my appreciation for Lara Parker, Nancy Barrett, and Grayson Hall has grown, I have come to appreciate NoDS as an atmospheric ghost story featuring my favorite actors from the original series. I love how Lyndhurst feels like an entirely new estate, separate from HoDS, and, as others have mentioned, I also enjoyed the flashbacks and the actors playing different characters.
I'm one of the people who was incredibly disappointed by the DVD and BluRay releases' entire lack of restoration. It's beautiful to look at, however (though disconcerting due to missing musical cues and editing SNAFUs, like Angelique's weird, misplaced laughter in the first flashback scene), and that makes me happy.
As a sidenote, as we discuss the plot of NoDS and its similarity to a dozen other haunted house movies in the '70s, the last time I watched "Let's Scare Jessica to Death" was strongly reminded of NoDS: unstable tenants in a spooky, rural house, the doubling of actors, the creepy/sexy revenant, the intense '70s feel of the piece, the downbeat ending.