Although this talent makes you hit really hard with wrath I can't figure out a way to use it in PVP as Feral. As most have said, you won't be wrath spamming for 45 secs. Also a half-minded player will probably try to interrupt and, as feral don't really stack haste, your casts are so slow that even without interrupts it's not much of a big burst.
I prefer Nature's Vigil for PVP. The part about aoe healing on damage is the only thing i don't manage to use a lot. I just pop it as another damage bursting cd with incarnation + TF + Berserk and ravage spam. That's actually a nice burst, you can instant heal yourself for more damage, and if your partner is nearby he will get healed.
Although this talent makes you hit really hard with wrath I can't figure out a way to use it in PVP as Feral.
As feral I found it mostly useful as a survival CD because of the non-guardian bonus combined with the extra healing it gives which is useful even when casting NS+HT in bear form. It can come in handy to live a little longer as an orb carrier in temple of kotmogu, or as a flag carrier.
It also helped me keep a flag carrier alive with heals on a couple of occasions. This works best when starting to heal directly from stealth so you have time to get some healing done before anyone notices you, then you can tank in bear when focused - it works quite well sometimes in random BGs at least. But it's clearly situational.
In PvE you can burst a lot with HotW + wrath spamming with caster staff but still, i think that in larger fights and with good stats DoC will be better. I think you still maintain better sustained DPS with DoC when you master to use it.