Glad you found this useful!
Thanks for that. I'm mainly talking about live WoW testing I did a few weeks back regarding the SP coefficients and base heals. Anyways, thanks for the info. I'll try to find some time to do more testing.
Anyways, more on Crit vs. Mastery vs. Haste
Crit vs. Mastery vs. Haste
If you don't understand proper spell selection, don't even bother reading this. The benefit you gain from optimizing gear is NOTHING compared to good play. This pretty much applies to all classes and specs.
This discussion only applies to item budget. I'm not going to discuss raid buffed 40% crit vs. 100 haste rating. That's not fair because raid buffed crit includes crit from int and other random sources. This is for a gear to gear (reforge, gem, etc.) comparison. To be fair, we need to compare the <whatever> from rating ONLY to <whatever else> from rating only.
45.91 Mastery Rating = 1 Mastery
45.91 Crit Rating = 1% Crit
32.79 Haste Rating = 1% Haste
100 Haste Rating = 3.05% throughput (measured in HPS) increase for haste
100 Mastery Rating = 2.18 % throughput (measured in HPS) increase for mastery
100 Crit Rating = 1.09 % throughput (measured in HPS) increase for crit. This is due to 2.18% increased chance to crit * 1.5 crit bonus.
Please remember, that these % increases are increases as if you had 0 of a certain stat. If you already have 900 haste, an additional 100 haste will boost 3.05% of what you would have with NO haste. Likewise, the same applies for discussions with crit and mastery. Crit and Mastery are more complicated because you already have some base crit from intellect and 3.3% that's just there, and you start with 8 Mastery just for being a holy paladin. The % increases don't multiplicatively stack with those base benefits.
Also, this assumes all bonuses are used to their full extent. Crits are not overheal. Mastery shields are fully absorbed. Haste is not GCD capped not is it overhealing.
So that's the easy part done.
Secondary (Good and Bad) Effects of Haste
The problems with haste come from, that while HPS go up, expended MPS (mana per second) go up accordingly. This can be counteracted by simply not casting. But this sort of wastes the haste. The unspoken benefit is that haste eases reaction time requirements. If someone's going to die right away, haste means the heal comes off quicker.
GCD capping cuts off benefits to haste since you can't cast any faster, but the reaction time benefit for casts still applies. GCD softcap for holy paladins in a raid environment is 894 haste rating.
Haste contributes to Overshield, which I'll discuss below.
Secondary (Good and Bad) Effects of Mastery
And this is the precisely the reason World of Logs is fail right now. Paladin Mastery usage isn't tracked right now.
Wasted shields, or what I call Overshield, occurs when:
1) A shield falls off in 6 seconds without being used.
2) Another heal lands on the target before the old shield is used. The weaker of the 2 shields is wasted.
Trying to predict/model overshield is REALLY hard to do, especially without logs to confirm the any models. Best I can tell, Case 1 almost always occurs when raid healing unless we have an aura fight.
Cast 2 almost always happens when healing the tank, because we can usually get multiple heals in between boss swings, and the tank is likely to avoid some attacks.
Exactly how much Case 1 and Case 2 apply, is anyone's guess, but if I had to guess, 2/3 or more of total shields are wasted.
What makes this MORE complicated is that you already have 8% shielding. For your mastery rating to be useful, that 8% must be eaten FIRST. So in a weak aura fight, if you had 15% shields, and the aura only eats 10%, then the 5%/7% of your shields are wasted.
Secondary (Good and Bad) Effects of Crit
1) Keeps Conviction rolling
2) Procs Infusion of Light
Overheal is the reason crit is bad. We can't pick our spells and HOPE for a crit. People die this way. So if a crit holy light could top someone off, but a normal wouldn't, we might as well use Divine Light. This is still a big deal in ICC. This might change in Cataclysm when it's ok for someone to sit at 50% health. If I had to guess. however, come Cataclysm, haste and spirit will still be better than crit, but we'll see.