Seraphs and Sword-demons are still a highly represented facet of the mud, but as was said earlier (forgive my lack of quoting) that's likely due to the amount of inexperienced players picking a sub-par race rather than due to the races themselves being good.
I personally think that's a fine niche for them to fill. I was a sword-demon at one point, and got rid of it because it was pretty awful. They do have their strong points, still, if you don't ever get into a PK battle for instance, their crit drawback is pretty irrelevant. Few mobs do disruption or holy damage.
