I saw a guy walking around with the St5 Dokoku the other day but I didn't ask him any of this stuff. I think he might be JP? Thought there was someone posting on here, not on this thread but a different one, saying he had St5 and did...some stuff with it? He seemed to have at least a lukewarm opinion of it.
I definitely think it's extraordinarily niche and I think I would put it as the second or third worst prime.
Lorg Mor IDK...maybe if you can keep up AM3 with GEO it could be a good nuking piece, but cmon...Both those jobs have pretty compelling reasons to change their main hand on a very regular basis. Without AM up, it's very bad. Best thing I could say about it is it gives club users a way to make Darkness which is...technically a thing. I think the niche of Lorg Mor is even smaller than Dokoku, personally. They're definitely both very bad though when compared to their peers.