SoCorruption is only useful in raids... simply cuz ive seen no 5-man bosses that actually last long enough to be worth it... most bosses are dead in 30-40 secs and with the gross ramp-up time on SoC (Blizzard can say what they want..a nerf it was) it-just-aint-worth it.
Its SoR for anything that aint a raid boss (and even then only if you are not required to switch targets)