@Meygaera: You can check my armory-link here to the left for such a build, personally i went with 1 points from KM but I guess necrosis would be about the same.

I tested a spec with 1/2 CotG for about 15 minutes on a dummy to test the rotation, and I agree that it is definately workable when you factor in HoW. You can use HoW and/or regular Rime procs to fill in an eventual vacant GCD which meansa bit of lost damage, but the talent point spent elsewhere (KM, BCB, Subversion, depends on where you stole a point for UA) should cover the loss in terms of DPS. This is also without factoring in AMS soak and RP regenerating procs from healers.

Alright, so what I said was true.

The simulator creates an absolutely maximized personal raid DPS environment where you actually have a full 35% of the simulation with execute, but it doesn't take into consideration the execute range of other classes thus the shorter duration of your'e actual execute range. Since this is the case, and BCB already showed to be better DPS above, that would mean the only reason to take MC over BCB is if its a mobile fight or if the execute range is an important factor to the fight (Algalon / Yogg). I would imagine proper use of UA would assist MC more than BCB, however, as I said, I don't use UA and thus I don't include it in my calculations.

@Asphyxia: Didn't your calculations show BCB was inferior though, you mentioned 2.0X% for 2/2 MC and 1.8 for 2/3 BCB. The execute-phases also tend to be important burn phases on alot of bosses (i.e. Steelbreaker) and alot of guilds opt for using Heroism/Bloodlust at around this percentage.

If anything we can call this a personal preference too. We should refrain from calling what's the "true" best DPS per point until actual simming and proper calculations have been done, since you usually aren't objective enough to be the one guy calling it out. For example _alot_ of people DO use UA.

I think it's really time to drop the subject of where to put a random 5 points that might make 0.1-0.3% dps difference. If my KM procs an extra time i already got that dps difference out of there.

I think most of the stuff that has to be said on the subject has been said. The general consensus is that Subversion is better than BCB due to the secondary benefit (threat reduction). DPS wise the difference between pulling points from Subv / BCB / MC / KM is less than getting an unlucky streak on a boss. These difference fade away in the random RNG that you will encounter on a boss.

As for UA. I think it is save to say that it IS a dps boost, but only if you:
a) Know at what time in your rotation to pop it. If you use it at the wrong moment, it could be dps decrease.
b) Know when to save UA for burst moments or chain it whenever the cooldown comes up.

Again we're talking small dps differences though, simulators (which pretty much is best case scenario) showed something like 100 dps gain if i remember correctly.
When doing 7k dps that is still only about 1.5% dps. That's nice, but again if you mess up your rotation by popping UA in the wrong moment you might nullify that gain.

I think we should close the subject of these small preference changes though, and shift our focus to the CC gear combinations. And drop the talent issue unless it's about a big differences (blood / unholy subspec; even though a lot of that has been discussed as well).

Just wanted to get a sanity check on one item with the GoDisease spec rotation.

In the OP, the suggested rotation "once diseases are up" is:

OB,OB,BS,Pest,RP,RP
OB,OB,RP,OB,RP,RP

The item I'm looking for a sanity check on is the, "once disease are up" portion of the post. In order to produce a state where you can proceed with the actual GoDisease rotation, you must have FFUUBB runes available and 0 Death Runes active while FF and BP are both up on the target. If your opener round is:

IT,PS,OB,BS,Pest,RP
OB,OB,RP,OB,RP

It would create a situation where you have FFUUBB available and 0 Death Runes active while both diseases are up on the target. This is the only viable method of producing the required state for the GoDisease rotation round that I can see within the disease duration time constraints (assuming 200ms of latency at 1.7s per GCD). Is there some other rotation that is used as an opener?

Your starter rotation goes like this:
IT PS OB Dump BS Pest

Then it continues like this:
OB OB Dump OB
OB OB Dump BS Pest

Somewhere during the fight (pref early on) you want to replace 1 OB with an IT / PS combo with your procs up so that your diseases then carry on the entire fight at maximum possible damage output.

I've seen this question asked numerous times, but never have I seen a clear answer (one that doesn't spam me with all sorts of numbers -- because I'm terrible at math -- which are appreciated, but mean very little to me. All I see are hieroglyphics) as to the gem stat priority for a DW Frost DPS. Should I ever gem for hit or expertise? Is 9% hit dangerously low in the case of DW Frost, or should I just hold it to gear to get me through and gem strictly for strength as I've always done?

I gem for expertise to ensure I remain at the dodge cap, but I haven't really noticed any shortage of hit on Ulduar gear, and am spell hit capped as it stands without gemming at all, so I've never really been in a situation where I've been that low on hit, not since I started DWing in 3.2.

@Sabellian: It HAS been answered before without "math", not without numbers though, since thats the only way to answer it! Both the expertise softcap and the special hit cap (5% for frost DW cause of NoCS) are worth more than strength and "should" be gemmed for. The spell hit cap is still worth quite a lot (compared to what we guessed it would be) but not on top of strength.

The easiest way to approach Expertise and Hit in relation to a rotation is that they aren't actually increasing your DPS, rather they are reducing the chance that you suffer a DPS loss. The closer you get to the caps, the smaller the chance is for a miss or dodge, but if a miss or dodge occurs it's as big of a DPS loss no matter if you have 0 expertise or .5% to cap.

The closer to cap you get, the smaller the chance of getting a dodge or a miss is. If you have 1% miss chance, you will theoretically miss 1% of your abilities. But the actual number of misses could be 2 or 3 out of 100 specials, or 0 on 200 specials due to the 1% being applied to each attack separately. In case A, capping Expertise would have increased your DPS more than Strength. In case B, the extra Expertise would have done nothing.

Overall, capping Spell hit and Expertise ensures that you will never lose any damage because of your rotation breaking, but it's impossible to set an accurate point worth for the stats as the effectiveness of the stats all rely on chance.