You spend 4 GCDs (about 5.8 secs with haste) if your are NOT CCd so you can TRADE the most damage dealing skill for a 38k healing (8% life).
This is not a joke, this is how the spell works.
Any DPS hits for 25k per second no burst (on Resil), meaning on the time we can trade DPS for healing we have taken about 150k damage on the time we get to trade damage for a 30k heal.
This is the biggest most reliable survival tool from the class that as Blizzard states "is able to outlast they're enemies".
Ret have a lot of problems on sustained DPS, makes no pressure out of CDs and the only way to try not to die is to trade the already abyssal damage for an pathetic healing. The MATH is broken.
At it is, Ret will never be able to make pressure and never be able to survive. Even if Ret is only doing TVs there is not enough sustained DPS. If Ret is only doing WoGs the heal is LESS than other DPS healing and Ret is trading damage for that as other specs are not (except for Rogue Recuperate) but even so, TV is about 30% of the damage and glyph reduce damage for 10% - this makes WoG an USELESS skill.
The only way WoG can keep someone alive is if there is HA active so you can heal for 125k over 10GCDs - wich is STUPID becouse ALL DPS healing habilities (Dark Regeneration, Exhiliration, Desperate Prayer, Cold Snap, Death Pact) heal for that and it takes only an GCD to activate it. If Ret takes any disarm/silence/CC Ret can't generate HP so he can't heal.
So if I use HA to WoG, hit Exo than WoG, than CS than WoG, than Judge, than WoG, than CS, than WoG I can heal for an instant button like almost all other specs have. BUT during this time (15 secs) I can ONLY use that habilities and in that order so I can heal - if ANYTHING happens (CC, LoS, bubble) that Ret can't hit for 1 GCD this means 25k less healing and mostly if Ret get an 8 secs fear this means 75k less healing.
All other specs heal for that amount with one button. Imagine if Lock get CC'd Dark Regeneration stops healing. Blizzard looked at if Second Wind is stoped by stun it whould be wrong, but they do not look at how Ret PVP works.
Not to mention that Ret DPS is OK using HA ofensive and not to survive. And during this time if you want to make the same amount of healing as other specs, besides not being CCd/LoS you will NOT be able to trow any utility/CC/etc during this time. Or else your 18 secs life saving CD will be wasted (I already told HA should work for 7 3HP generations instead of 18 secs so it's not that impaired by disarm/CC).
So Ret WoG for PVP is between completely useless and 10x worse than other specs version. Blessed Life won't solve becouse Ret trade GCD AND Damage for WoG - as you see the math, even if Ret have INFINITE Holy Power the healing amount of WoG whould be not enough. And on top of that Ret loses DPS for it, so this is the dumbest idea of all times.
Sword of Light: Increases healing done by Word of Glory by 200% and has 10 secs CD.
So WoG will heal for 90k. This means Ret can only trade DPS for heals every 10 secs - THIS MAY LOOK OP - but is an actual 10k heal buff over 10 secs (becouse WoG is already weak as it is and Ret is already making less pressure/damage to do it). Why this is not OP? WoG as it is heal for 40k over 6 secs, this means 80k on 10 secs.
This buff will mean a 10% healing increase on WoG, 3 extra Holy Power over 10 secs, less GCD spend, increase Ret sustained AND survivability but not too much - the most of it, Ret becomes less impaired by CC, heal for a decent amount on demand.
On an alternative, bring back Last Word/Sacred Shield so to make the same numbers. Either way, Ret get a 10 secs CD worthy WoG or Ret is broken.