I've been watching it since it aired and its pretty decent .
The strongest point of this show is its animation which is fantastic . The art style is pretty old school but its done in a way that makes it up to par with some of the recent animations released.
The thing i don't really like is how the story is told . So far , most of the episodes involves Casshern visiting different parts of the world and seeing the ruin and destruction hes supposedly caused .
I initially didn't have a problem with this but after 14 episodes of Casshern going emo and characters who are introduced and die in the same episode left and right its starting to get a bit old and annoying . Looking at the preview for episode 15 , it seems like its going to be another one of those episodes .
So far i'll give it a rating of 7/10 . Its saving grace is basically its animation while its weakness is its currenly paper-thin plot (due to lack of progression) and its slow plot progression.