RoJ alone is fairly poor. SoH is godly though, and smite hex + smite condition for a melee is a great combination, they are in the area range (which is 10x better than adjacent). Judge's Intervention is also particularly good for Dervs, combined with SoH you are looking at about +35-40 damage per swing.
Real problem with RoJ itself is the adjacent range. The only reason you really want to use a smiter is if you are a melee, and if you are a melee and enemies are clustered in adjacent range then Splinter Weapon deals damage 10x better than RoJ. This isn't even unique to RoJ, the majority of of adjacent spells in the game have similar issues unless they are really quick recharge/cast time. RoJ is on smite bars more because... well look at the other Smiting Elites.
Personally I like Rt/Mo Channeling/Smite combinations more though. The monk primary just doesn't do much for smiting while a rit primary boosts exponentially the best physical buff in the game and adds a lot of energy management.
Also UA's are pretty bad, don't run them.