I did some testing on the PTR dummy. These first two splits are with Primal Gore and glyphs of Savage Roar, Rip, and Shred. The third split has no Primal Gore and uses glyph of Mangle in place of Rip. I used no buffs and had 6756 AP, 46.47% crit, 198 haste, 109 armor pen, 194 hit, and expertise capped. Also had 2T7 and 4T7 bonuses.
With Primal Gore and glyph of Rip:
#1 -
Wow Web Stats
#2 -
Wow Web Stats
Without Primal Gore, glyph of Mangle over glyph of Rip:
#3 -
Wow Web Stats
I was pretty disappointed with how dependent I am on mods in order to keep a reasonable debuff uptime. RoguePowerBars is bugged on the PTR so I had to watch my buffs and debuffs spread over my UI. My buff/debuff uptimes for the runs were:
Rip Rake Savage Roar Mangle
87% 88% 97% 94%
89% 93% 97% 98%
74% 87% 95% 96%
I also found, as others have stated before, that getting 3 Shreds in before Rip expires is not trivial, and it will be even tougher when we lose the 2T7 bonus. It also led to some inefficiencies on my part, where I would try to squeeze in another Shred to lengthen my Rip at the expense of other abilities only to discover that I'd already used my 3 Shreds. A mod to track how many Shreds you've used on a particular Rip will be absolutely necessary. Running without glyph of Mangle also requires you to wait until the last possible second on your Mangles and Savage Roars if you want to have a prayer of getting your Shreds in.
Obviously there was a big difference between the first 2 splits and the third one. My dps rose about 26.5% by using Primal Gore and glyph of Rip. My play was particularly sloppy on that third run with a pathetic 74% Rip uptime, but that obviously wouldn't account for such a massive increase in dps.
The damage contribution from Primal Gore is simply staggering. On the third split Shred and auto-attack accounted for 50% of my damage while Rip and Rake made up 41%, which matches pretty much exactly with what I see on Live. On my first two splits Rip and Rake accounted for 57% and 55% of my damage. On those 2 runs Primal Gore alone accounted for 19% and 17% of my dps. By comparison, OOC was about a 4.5% and 5.7% increase in dps (ignoring it's contribution to combo point generation) assuming I used each one on a Shred.
This was with 0 buffs, suboptimal gear, and sloppy play. If my runs are any indication Primal Gore is about 2-3 times stronger for dps than OOC, which itself is quite overbudget. I see it at least getting put back to a 150% crit like it was originally.