So 0/45/16 is the best now then, right?

I actually value expertise quite high. Since it affects both yellow attacks and white attacks. +Hit affects white attacks, Expertise affects both white attacks and yellow attacks. White attack accounts for about 50% of damage, WF and SS about 30% and 10%, and Shocks about 10%. Since Expertise affects Tying Windfury to Autoswings and Yellow attacks, that puts white attacks + white triggered WF at 74% and SS+SS triggered WF at 16%. Expertise will effect 90% of combat table, while hit contributes to anywhere from 50% to 74% of combat table. (50% because it at LEAST affects all white attacks, 74% because white still needs to hit to have a chance to proc windfury) The value is between these two because hit by itself does not affect Windfury's miss rate, but does increase Windfury's proc rate to an extend.

So using my personal value of hit @ 1.84 AEP accordingly to Yo! Simulatr (2518AP, 27.16% crit, 17.84 hit)
My expertise value weigh anywhere from 1.84/0.5 x .9 = 3.3 (high end) to 1.84/.74 x .9 = 2.23.

Assuming my math method is correct, point for point expertise is actually better than strength, even after kings. I haven't done math critical analysis in a while though, so it is likely (and welcomed) for one of the math experts to come out and correct me.

Right, it's a great stat, but unless they've changed it rating is only of use if it increases your "expertise" by a whole number. So for the shoulders mentioned above the first 8 rating give you 2 expertise, the other 2 rating are useless. I'm just wondering if that has been changed, or if the various calculations(maxdps, lootrank, etc.) take that into account?

Loot Rank et al. can't really take that into account in the scores they assign to individual items, because you might have expertise rating on another item that would make the other "left-over" rating useful. In your example, if I had 2 items that each gave 10 expertise rating, I would actually end up with 5 Expertise. The best way to handle this at this time, IMO, is to under-value expertise rating a little bit, or to calculate values by hand/Excel. (I personally find that [Shoulderpads of the Stranger] and [Shoulders of the Hidden Predator] are in a virtual dead heat for the best item, and since I already have the former I'm not going to get the latter until no hunters want them.)

Re: expertise, I'm currently using

brooch of deftness: 21
vashj belt: 25
shoulderpads of the stranger: 10

to make exactly 56 expertise rating, which is nicely divisible by four.

You will say the math is wrong. Because I actually use some global cooldowns like SS, racials, summoning totems, shamanistic rage, water shield etc. And ofc sometimes I hold back shocks to prevent overaggroing. I realize that. Thank you. But still.

My build is 15/46/0 with Concussion and Revebration. During raids (KZ, no post-Kara experience with this shaman) my shocks hit for 1200-1700. Overall DPS is 700-800. So eventual DPS produced by shocks - damage divided by 5 (divided by... let's say 8) - varies as 240-340 (150-212.5). Which is way more than 10%.

(And ofc. There are situations when I use weapons and hold back shocks. But sometimes I can't apply weapons for short periods while actually striking with shocks. Like chasing/moving to trash/adds.)

Correct me/explain me this please.

The Math i'm doing is assuming a non-Elemental Devastation build. It is rather easy to modify it to your needs.

Assuming that your Shock damage does X, then for the math above, for every 90%, or 0.9, replace it with your value, which will be (1-X), or 100-X %

This means that expertise will be weighed different for you, with lower than expected value.

Then, look at your windfury proc % in relation to dmg, and divide it proportionally among white attacks and Stormstrike (say typically 4-5 : 1 for a enh/resto). This isn't completely accurate since Stormstrike would be hit capped while White is not. Which means assuming there are equal swings, SS will proc a bit more windfury. However, this is just to help you get a ballpark's view at how much expertise weights. When I do have time in the future, I'll look at this in a furthermore quantative method.

Edit: L2read

I want to apologize in advance for the following question, I am almost positive the answer is here somewhere but as of yet I haven't been able to find it. But its a fairly simple question, hopefully someone knows.

Do Tsunami Talisman and Madness of the Betrayer share a Internal Cool Down with each other?

No.

Looks about right to me.

The way I'd do this is to find how much expertise you're wasting, subtract it out, and do the rest of the calculations based on that. Let's say you have 0 other expertise rating. That means you should only use 24 of the 25 ER on the belt for dps calc purposes. ER, as a rule of thumb, will be valued at about 2 times your hit rating.

So, I'd say that the ER on the belt would be worth 1.8 x 2 x 24 = 86.4

I'm assuming you did the rest of your math correctly, as it jives with my memory that the Vashj belt is pretty easily the best in the game for most people's set ups.