I think the drop in animation quality is bit exaggerated, but not completely, it looks pretty different from S1. Some of it is just different coloring, way of drawing characters (not completely different like with some animes but still noticeable difference), using more cgi (i think they pretty much computer animated Genoses whole body so it looks bit weird sometimes with his head when in S1 it wasn't) etc.- it's bit of art style direction and choices that are different and those can be up to taste a bit. But I think especially in EP2 there was some serious issues for me during fight scenes it just wasn't fluid at all and they used long periods of characters talking to themselves (thinking) against white background which seemed like easy way out. But again I liked newest ep so maybe J.C.Staff has put more resources and animators to OPM now to fix it or maybe they changed episode director idk. I don't think newest ep had any character talking against white background during fights really.