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.
By the first episode, the fans were already divided in camps between either Blood: The Last Vampire, Blood+ and Blood-C, debating on 'which' Saya they like the most and which story is better.
The last two episodes really cause a more diverse response where some think that it's brilliant while others think that CLAMP has gone too far.
Captain Obvious Reveal: The commentators on Nico Nico are dead right on Fumito being the mastermind, that the whole town being a set-up for his experiment and that he's drugging Saya with coffee and marshmallows which results to her memory loss. Most of the viewers already figure this out by episode 8 due to him, narrating with Saya in handcuffs as seen in the flashbacks. And when episode 11 rolls in, it doesn't come out as a surprise.
Darkness-Induced Audience Apathy: By the end of show, the entire cast are revealed to be actors who are requested by Fumito to play as Saya's friends and family for his experiments and most of them are actually assholes. You won't feel sorry for them when they're being slaughtered brutally. Saya herself is hard to root for since she's portrayed as a Designated Hero who can't even protect civilians in the first place despite that Fumito is responsible for hindering her true abilities. And with the whole town massacred, well, they're basically doomed already.
The movie may let you root for Saya as she pursues her revenge against Fumito. But the ending just drops it off where it is revealed that Fumito is in love with her and that his actions are basically his attempt to ensure her suvival and to restore her ability to feed on humans which he failed. Regardless, none of these can redeem him for the countless crimes that he had committed such as having the rest of the civilians in town massacred and turning Mana's dad into an Elder Bairn. At the end, Saya goes on an aimless journey and just earned herself an Esoteric Happy Ending.
Designated Hero: Saya, particularly her actions in episode 6 and 8 where she lets a number of people die before she could move in. This caused a lot of viewers to see her as the Failure Hero and her mourning over her dead classmates didn't help. This was justified in episode 11 and 12 where Fumito drugged her which hinder her true abilities and personality. The movie averts this where Saya is competent enough to save a person.
Ensemble Darkhorse: The Dog! A lot of people speculated that it's Kimihiro Watanuki due to his voice actors (both Japanese and English) and that he mentioned owning a shop where he grants wishes. And not to mention, the ONLY character who is on Saya's side and knows what the hell is going on.
Genius Bonus: Anyone curious about the term "Shrovetide"? This is actually an obscure term from Catholicism that describes the beginning of Lent. According to the Catholic Encyclopedia, it is a time of "taking away the flesh". Of course, Catholics mean this figuratively, whereas this show obviously means it literally.
Viewers unfamiliar with Japanese culture may be unaware that the "Elder Bairns" are actually based on youkai. Look them up here if you like.
Hilarious in Hindsight: Saya's life is being orchestrated as Truman Show Plot and an experiment and everyone (except Saya, Fumito and Yuka) all die at the end in the hands of a wacky monster. Then, the 2012 movie, The Cabin in the Woods, has the similar premise as well which includes a guy being stabbed by an unicorn to boot!. Of course, the movie used to be shelved in 2009 before being released in 2012.
Narm: Episode 12. In two words: the Bunny Blender. The whole town being slaughtered by the Elder Bairn, kind of loses its own bite, when the creatures doing it look like giant pink and cream rabbits with 'arms' as ears. Not to mention the bit where one stuffs a load of people into a giant bag, then another turns its hand into a blender-type thing. Would be horrific... if it didn't make a typical electric blender sound.
The narm is so strong that it has reached meme levels: Best comedy of the year, indeed.
Which is multiplied when you combine it with Yakety Sax.
Nono and Nene's definitive deaths become ridiculous when you recall all of the Panty Shots they have as they get gruesomely slaughtered. It may have been intended as Fan Disservice, but still...
Some of the Elder Bairns designs (like the train car marshmallow Elder Bairns from Episode 3 and the mentioned bunny Elder Bairns from Episode 12) looked cartoonish and campy compared to the other Elder Bairns designs which looked creepy and sinister-looking.
As this video shows, many of the deaths are so over the top they cross the line from gorn and go straight into narm.
The Scrappy: Saya. In the first 4 episodes, a lot of people see her as a Mary Sue. Later, her failure to save people pretty much nails the mark. However, the last 2 episodes and the movie reverts this.
Snark Bait: Watching this show on Nico Nico Douga will result in tons of 'snarky' comments from members.
2ch and 4chan were just as snarky during the livestreams.
So Bad, It's Good: Even its detractors consider it still fairly entertaining for this reason.
Though most of the characters are hired by Fumito to act as Saya's "friends", the biggest one is Tadayoshi, who happens to half-human, half-Elder Bairn. It would be interesting how much he has been under Fumito before the events of the TV series. Only those who have read Blood-C: Izayoi Kitan would know what he is before he worked with Fumito and sadly, that manga hasn't been licensed or scanlated yet.
This goes the same with Yuka. She's a 28-year-old woman who only joins the experiment so she can be the governor of Tokyo and doesn't really care about the gruesome events in Ukishima. She even appears in the movie but only in two scenes where she eventually got her wish in the end. It would have been interesting on what kind of role did she contributed to Fumito's organization and possibly, her interaction with Saya if only these two ever meet again.
Tough Act to Follow: Given the cult success of Blood: The Last Vampire and Blood+, CLAMP had to work with Junichi Fujisaku (one of the pioneers of the Blood franchise) to make the Blood-C a success. Sadly, the reception is mixed with the low BD/DVD sales and it turns out in an ANN interview that Fujisaku only worked on the fight scenes, and CLAMP (particularly the writer, Nanase Ohkawa) are in charge on the story.
The movie itself still has the similar outcome by despite having a different director (who later directed another Production I.G. anime which became successful). But it fared better than the TV series.
Episode 8. Yeah, nice going Saya! Really good of you to just stand there while an Elder Bairn started coming towards the class and not warn anyone to run. Plus, she just stands there and waits for about half the class to get killed off- before she even considers fighting the monster!
Not to mention the students themselves, who just stand around dumbly, 'ogling' the Elder Bairn until it starts its major killing spree It is worse with the last remaining students after the spider has killed almost the entire class, instead of just getting the hell out from the building while Saya is distracting the monster, they just flee to the roof, from where they cannot escape. Of course, the Elder Bairn gets them cornered and killed easily
The Motoe twins, Tokizane, and Kanako. Yeah, there isn't any way that trying to betray a Magnificent Bastard, with a collection of deadly beasts at his disposal, could possibly end badly. No way at all...