It always seemed like that to me, though I thought it was amusing since it was supposedly on a very strict budget. (hence them not hiring faces for the Akumaizer 3)
Dropping comments in on episode five since I'm somewhat behind today:
Was interesting to see that (I might have heard wrong) Sairen was the one that told Zabitan about how wonderful the human world was, but he couldn't leave once Mezalord promoted him. I tend to love these stories involving heroes fighting to get back their allies and kinda wish it had ended differently, he could have made a really cool additional hero and definitely carried that aesthetic that set him apart from the other demon clan members.
Also, dear lord Darunia's laugh never stops being annoying and I probably shouldn't have, but I found it amusing that Zabitan slapped her in the heat of the moment.