Despite the bad score I gave this show, I don't think it's completely irredeemable. I actually really enjoyed some episodes individually, but as an overall experience though from start to finish I'm not sure I can recommend it.
The first thing we see in episode 1 is a gothic castle, shrouded in mist that really sets a creepy, atmospheric tone that I found pretty enchanting. By the 3rd episode the tone completely shifts and we're getting cutesy arguments between the tsundere main vampire girl, Hazuki, and Kouhei, her unlikely rescuer. It's actually hard to believe it's even the same show at that point, and the series continues to flip-flop between these two tones. The episodes vary greatly: comedy, drama, slice-of-life, romance, and action.
The plot of the show tends to come to a stand-still when the show is tackling more lighthearted themes, but I think these are actually probably the best episodes. These are the episodes where we see Hazuki and Kouhei develop as characters the most, and they were the ones I found myself the most emotionally invested in. The side characters are mostly good too, with Hazuki's guardian spirit, Haiji, stealing the show (though I'm sure some people will find her extremely annoying). None of the side-characters are ever developed very much though, unfortunately, and because of that I found myself massively preferring the episodes that centered on Hazuki and Kouhei.
The "plot" episodes tend to be more focused on action and are... not so good. There is very little explanation of how magic works in this universe, so the viewer is mostly left in the dark on what the hell is actually happening in any given fight scene. The show also has some problems with consistency. Characters randomly gain and lose abilities, and rules that are made early on for combat are later broken. The story is pretty nonsensical in general though, certain plot elements are never explained properly, and it was hard for me to get invested in it.
As far as romance goes, there is VERY little. Hazuki and Kouhei mostly have an older brother/younger sister type relationship. Though they do toe the line on a couple instances. It's a bit awkward since Kouhei is older and Hazuki is like 14.
The comedy is hit-or-miss. There are a couple of pretty funny moments, but it massively overuses random objects (usually wash-bins) falling on characters heads.
The worst part of this show is after episode 16/17 though. The last 8 episodes are extremely bad. Characters make decisions that border on nonsensical, villains randomly appear and then disappear, and there is a whole lot of extremely forced drama. The ending is extremely unsatisfying and leaves massive plot holes and unanswered questions. There are also none of the lighthearted episodes we previously saw in the series in this last batch. I actually wish I had skipped these ones because they left a bad taste in my mouth about the series overall.
The art is pretty okay for an anime from this time period, and I massively prefer the art-style of the anime to the manga. The music is actually pretty great. It's suitably creepy when the atmosphere demands it, and whimsical when something comedic is happening. The opening, "Nekomimi Mode," will probably be hit-or-miss for most people. I personally don't like it but it is extremely memorable at the very least.
Overall, it's an OK show, but I'm not sure I can recommend it. If you do watch it, I strongly advise you don't watch the last 8-ish episodes, due to the severe drop in quality.