I'm starting to have a look at rage since I'm getting very different results from the ones expected with wowwiki's formula.

d = damage done
c = 320.6 (constant @lvl 80)
f = 3.5 for mh hit, 7 for mh crit (1.75-3.0 for offhand)
s = weapon speed

Rage = (7.5d/c + fs)/2

It's quite a bit many people are experiencing conflicting values and I think the difference is not so small. Thus any spreadsheet based on wowwiki's formula is overestimating the rage generation of both arms and fury warriors.

I did few tests, still too few to even expect to derive a formula. Also I'm getting sometimes a sort of rage loss happening just after the rage gain. I don't know yet if this is due to addon and I'm making a small app to track precise data.
I noticed this ungeared with a 3.2 6 dps weapon. I was gaining 4 rage then suddenly stepping to 3. I actually think this could be due to Xperl but I'll update the info once I have confirmed it.

At first glance the formula on wowwiki states that you should only consider some factors that are damage dealt, weapon speed, the hand and wether it's a crit or not. Part of the rage you gain is then fs/2 that for a 3.2 speed mh hit is 4.8 and for a crit 9.6.

This is what i got with a 3.2s weapon completely ungeared:
Few normal hits for 130-137 -> rage gained 3-4 (no ER)
Few normal hits for 139-143 -> rage gained 4 (with ER)

I should have gained 5.6 rage at 0 damage and converting that ~140sh damage in another 1.5 rage. It should be at least 7 in both cases.

This is what i got with a 3.4s weapon completely geared:
Few normal hits for 1432-1437 -> rage gained 17 (no ER)
Few normal hits for 1721-1767 -> rage gained 25 (no ER)

fs/2 is in both cases 5.95 with wowwiki's formula, and in that case we gained 11 rage from 1435 damage and 19 from 1730 while we should expect 16 and 20 respectively.

I also compared 2 hits close in damage with and w/o ER:
no ER - damage 1619 - rage expected 24-25 - gained 19
w ER - damage 1670 - rage expected 30-31 - gained 24

I need a lot more data and I'm making a small addon to help me, but actually rage gain on live is half then expected when ungeared and about 1/4th less then expected at higher levels.

I'm pretty sure the fixed part of the damage has been lowered and the rage gain from damage done diminished by around 30%.

Actually it's rather annoying measuring rage gains and after a few tries I'm only relying on UNIT_RAGE event rather than rage bar. Anyway this event doesn't pass any other parameter then the unit so I have to measure rage with UnitPower() when the event is received. I don't know if this is the best way to do it and would appreciate any hint.

I didn't test yet with oh since mh data are odd enough atm.
I did test unarmed and ungeared but need more data. Atm I'm generating 2 rage (consistently) for 70 damage at 1.89s.
I'm experiencing some discrepancies (very rarely btw) where I get 10-15% more rage on a hit than normal (3926 crit -> 55 rage, 3967 crit -> 68 rage for ex) but I can't track rage on combat log and I need the addon to see how often it happens if it happens at all.

I'd appreciate any data and any speculation possibly backed up with data.

I confirm (after doing strange dummy tests):
Wowwiki formula wrong
You get full or partial rage on parry or dodge
1+ rage loss directly after hit

With being naked and using smallest DW 2h I could find,
I got sometimes 2-3 rage on main hand hit, wowwiki formula/kalgan post dictates I should get over 4 with that attack.

Could you explain this as both you and Hellord mentioned something similar. Are you seeing the rage gain and then it ticks off after your attack while in combat?

You swing and hit the target, rage increases, lets say by 6, and then a split second later you only have 5 rage. While still in combat.

Blizzard changes things without telling us all the time, or sometimes has mechanics that don't fully work as explained.

I don't know how related this is, but there have been times when I have 12-13 rage and attempt to shout (commanding or battle) and receive a "you do not have enough rage" error. I'll see my rage tick down one and try again and still the same thing. I don't use any unit frame mods and my latency rarely goes above 300 and usually sits at 170ms.

That's been since around 3.0 I think, back when they changed how rage decayed (went from 2 rage every 2 seconds to 1 rage per second I believe). And yeah, there is absolutely no way you can do two shouts with 1 Bloodrage anymore like you could before this change because rage decays absurdly fast. It's a terrible change, IMO.

Base weaponspeed? Not modified by haste? Would be quite surprised if it really is base speed

Using the actual (hasted) weapon speed would mean that stacking haste would cause your weapon blows to return less rage.

Whilst the differences we're talking about seem fairly minor, it would seem against Blizz's design policy for the addition of a stat to cause a reduction in efficiency.

As it is, using base weapon speed means that the first half of the equation is easily pre-calculated as it's not affected by haste values, which change all the time during combat based upon buffs/procs etc.

But what does haste do? Perhaps it makes you hit more frequently?

It seems they nerfed it to offset gaining rage on parries, dodges, bubbles etc.