It was readable and nicely drawn, and that's pretty much all the nice things I have to say about Black Butler. Here are all the not-so-nice things instead.
Firstly, the content itself was shabby. The overarching plot seems to be that Ciel wants revenge for the death of his parents, and for help with this he has sold his soul to the demon Sebastian. This seems to be forgotten almost instantly, as all we see Ciel actually do is bicker with his demon servant, bully people and get kidnapped. And as if to overcompensate, Sebastian is the perfect Mary Sue: attractive, unflappable, invincible and deadly, single-handedly resolving all conflict. The clothing is detailed and consistent, but anachronisms are rife and at times even the setting is forgotten as aspects of Japanese culture, unheard of in Victorian England, make their way in.
Secondly, I tired very quickly of the characters. Ciel is a brat, no two ways about it. I know his parents are dead, so it's understandable that he's not the most loving of people, but literally all he does is lash out. There is no emotional vulnerability and very little dwelling on his actual parents. Instead we assume he must be dwelling on his parents, because he sold his soul to avenge them, which would be fine except for the fact that he doesn't really seem to be getting on with it...
Sebastian, as mentioned above, is perfect. Enough said. The other four household staff are at best two-dimensional (I'll refer to them as the maid, cook and gardener, since spelling varies) and at worst entirely flat: Tanaka is permanently an anachronically-green-tea-drinking chibi, and what is his job, anyway? They are completely incompetent and serve only as an excuse for Sebastian to show off how impossibly capable he is, whilst patronising them and gaining their undying respect, because that's how people feel when they're patronised. I understand that later they show their worth as guards of the Phantomhive mansion, but if this is the case, why do they even bother attempting other jobs when all the effect they have is counterproductive? Ciel doesn't strike me as the type to put up with wasting money just because it keeps his staff happy.
Thirdly, I have no interest in fanservice and so do not enjoy wasting my time flipping through pages and pages of Sebastial hitting on Ciel. There are sexual undertones between the ageless demon and the twelve-year-old child and nobody seems to find this disturbing. Sebastian on his own is bad enough. We get it: he's tall, hot, dangerous and damn, does he take his gloves off in a pointless way. He has a pointed tongue (sexy?) and does a lot of acrobatics and strange things with cultery. And that's when he's not rescuing his poor vulnerable master from being tied up with belts and beaten up by big burly men. This isn't even the volume with the paedophile. Or rather, with one of the paedophiles.
I'm going to stop now. I'm going to stop, and I'm going to put down the book. And then I'm going to do what I should have done in the first place, and read something else.