I am trying to figure out what the whole appeal is to this series...it truly is very simple.
The plot isn't really intriguing; it also felt too familiar, not entirely unique enough.
The male leads are painfully bishounen. Maybe I am just too old (Who knows, maybe I would have liked it back when I was 16?) but it wasn't for me. These guys are very sparkly emo pretty with eyeliner and piercings.
I will say that the art can feel quite fresh, much dibs to that, it's not like others. But sometimes the scenes can be tiresome or too "empty", and there are plenty of them. I agree with Ibleda about the webcomicy feel about the whole thing too.
I wonder if maybe the series was created to dip into a hype - offerring prettyness and a cliched storyline, thinking this was enough for a particular type of general audience. In a sense, dumbing down on purpose thinking it is for a dumbdowned group of readers. Which, in context, should feel a bit insulting.
If you do want a light, temporary and colourful read, then go for it, there is no harm in that. But if you are more interested in more a intricate, original, mature, and detailed plot with truly complex characters, reach for another series.
Additionally, if you are also a grown adult, reach for another series.
I'm sorry, but it is a bit overrated. I know some folks will likely feel all heated, defensive, throwing the usual silly "Haters" line, but have to say it like it is. (Funny how some people can get all fussy because others have legit opinions on why they don't like something. People who have read and disliked Noblesse have moved on with their lives, surely the fans can do the same thing instead of complaining or insulting)