It has been a bit over a week since I repecced to Dark Rites so I thought I would expand a bit on the comments I made earlier. I have played with the spec a fair bit in scenarios, Open RvR, PQs and solo and levelled a couple of times in the process. My current spec looks like this.
In scenarios I have found the spec to be pretty solid. It certainly works best if your team is close to hand but with liberal use of Leaping Alteration it isn’t too shabby in cross group healing. My combat log still has around 45% of my healing coming via Tzeentch’s Cordial (a core ability so not affected by spec), 32% from Leaping Alteration, Dust of Pandemonium and Ritual of Lunacy with the other 23% from various sources. I did notice I used Flash of Chaos a lot more with this spec than with my previous Witchcraft spec, however I am not sure if this is due to the spec or because Order in T3 are targeting me more than they had previously.
In Keep attack and defence Dark Rites really shines. The ability to heal team members that aren’t in LOS is invaluable when fighting up and down the Keep ramps and allows you to sit out of LOS of the Order DPS while keeping all group mates topped up. Spamming Dust of Pandemonium can drain your AP pretty quickly but with a battle standard around to help it isn’t too bad. I didn’t get a chance to try the Restorative Burst tactic (3 more levels to go) but the synergies with Dust of Pandemonium are hard to beat as you have a chance to crit on each party member in range.
Solo a Dark Rites spec is pretty average. I found I struggled to keep myself up if I tried to take advantage of the more powerful Demon Spittle and my AoE heals just weren’t efficient enough to warrant their use. In some situations while solo I couldn’t even use Demon Spittle for fear of pulling too many adds so kills tended to drag out a bit more than they did previously. With a Witchcraft spec I was able to solo -1 champions without too many issues (apart from the time it took of course) but I found myself out of AP and very shortly dead even against -4 champs with the Dark Rites spec.
In group questing and PQs the Dark Rites spec was better than my solo experience. I was able to AoE mobs while throwing the occasion heal on group mates and felt slightly more useful than I did when Witchcraft specced.
Overall, I would rate a Dark Rites spec as great for Open RvR, ok for scenarios depending on group/map and group PvE and I would rate it as poor for anything solo.