I enjoyed Arslan Senki, but it definitely had a few oddities. Firstly, it seemed to have extreme time lapses - so much so that I felt like character development really suffered. That's not to say that the characters aren't likeable or fleshed out; they are, but some of the main cast are largely ignored.
Take Firen Gaysis for example; she appears out of nowhere to protect the crown prince. After she joins him her story is pretty much non-existent. Her role in the story is basically limited to chiming in every time Geeives says something, which is a shame.
Imagine how awesome it would have been if she, a warrior of the Goddess fought the religious fanatics directly? The blood-shed and suicides could lead her to question the divinity of the Gods -- giving her character more than just one dimension.
Arslan Senki: highly watchable but full of untapped potential and cursed with an abrupt end.