For what the intention with Seraphim is I think it's pretty nice looking, by no means "done" but it has potential. The seal switching talent needs a longer buff duration or seals needs to trigger a shorter GCD for it to be entertaining enough to maintain them, Final Verdict has no gameplay value whatsoever but I think that's the point.
I really hope the take a look at Holy Prism - Light's Hammer - Execution Sentence talent tier as well, in MoP the only real choice for us was ES but now because of snapshotting being removed it's just as "bad" as Inquisition was and they removed that... (Yes I'm still butthurt about Inq being removed T_T)