SoC works alright, the bonus damage means no more spectacular crits but then that's ok, Sheath of Light improves its damage enough anyway. A guaranteed crit is nice for the same reason every 'guaranteed crit' ability is, it cuts through Resilience. Yes the crit itself is still mitigated down and fair play, but it means you can build Vengeance stacks faster and as Jack says, control Art of War instant heals for when you really need them.
A common tactic I've been using when low on health is Stun/Judge/Holy Light (while they're sleeping) and instant FoL after they're awake again. If HL crits I don't actually use the Flash until later, dont wanna override the heavy SoL HoT with a crappy one, but all in all I have the potential to regain 60% of my health in one stun cycle instead of around 30% on live. This is doubtless aided by increased healing from SoL and loads more crits due to the mechanics changes.
To the original question, it doesnt 'really increase DPS' to be honest. The removal of bonus damage means SoC's DPS has mostly gone down actually. In PvE you'll want to take all the pure damage talents you can, don't bother with Improved Stuns if you're going Ret. Usually things should be dead long before your stun timer is up.