I've been trying to decide to what extent, if any, the Bear Form stamina modifier, Heart of the Wild, and the buffed Survival of the Fittest compensate for the problem of our gear's scaling versus a warrior's. Without itemization for +armor on feral gear, the bear form AC modifier becomes simply a compensation for the fact that we don't wear plate. The fact that bears and warriors have relatively similar AC on live (as in previous posts) confirms this.
That leaves us with four tanking stats at our disposal (stamina, agi, dodge rating, and defense), and defense is so laughably bad a stat without the need for crit immunity that I'm tempted not to include it in the list at all. Itemizing for dodge rating hasn't happened in the past, and anyway it's worse than agi.
According to
WoWWiki, the item budget formula is
ItemValue = [(StatValue[1]*StatMod[1])^1.7095 + (StatValue[2]*StatMod[2])^1.7095 + ...]^(1/1.7095)
Suppose we have an idealized tanking item for each class that has exactly equal "item budget's worth" of each tank stat.
The druid one might have:
60 agi
90 sta(=60 "points")
The warrior one has stats distributed between 5 of their stats, say
35 def
35 block
35 strength
35 dodge
52 stamina(= 35 "points")
These two totals result in roughly the same item budget for the item, i90, if I've done my napkin-math correctly. That would result in the druid item having
120 item points' worth of stats on it, and the warrior's has
175. That ignores all the % scaling talents that bears have.
Applying SotF and the bear form modifier, 60 agi becomes
63.6 points (60*1.06), and 90 stamina becomes
98.58 points (90*1.06*1.55)*0.67 for the item budget factor. So, then we effectively have
162.2 item points' worth of stats.
Doing the same for warrior's talents, they get 5% more stamina and 10% more strength from Vitality, so they have
38.5 effective points from that 35 strength, and
36.4 from stamina, for a total of a
179.9 points. We still lose.
However, I think it's unrealistic that a warrior item would include so little stamina vs. avoidance as in my example--they need to end up with roughly the same HP pool as the bear, right? So maybe their item has:
20 strength
20 defense
20 dodge
20 block
110 stamina(=73.3 "points")
(I'm rounding a bit sloppily so it isn't
exactly the same item budget, but you can see where I'm going.)
That's
77 effective budget points of stamina and
22 of strength, totaling only
159 points for the warrior.
In that more realistic scenario, we come out ahead in terms of the "effective" points gained. These are very coarse examples, but it's not unreasonable to think Blizzard
could tweak items such that they have the same "effective" tanking budgets for bears, warriors, and paladins given the existing class mechanics.
How those "effective budget points" translate into time-to-live is complicated (as outlined in
Tossk's analysis), but at least we're still getting our money's worth of item budget if the warrior has any HP to speak of. (Of course I'm discounting the diminishing returns on dodge, which will hurt us more than warriors because we have more of our eggs in that basket, but that's another topic.)
The problem right now is, looking at the
Naxx feral set, it really looks like cat gear to me--so much of the item budget is spent on DPS-only stats like crit rating and AP. Okay, these buff our threat, but they don't help us out with our survivability. Compare with the
warrior tank set, which has four or five of the stats on the item devoted to survivability. (To say nothing of the annoyance of getting AP instead of strength, more less-than-ideal budgeting...)
I guess in the end I really don't understand why Blizzard seems to suddenly hate the notion of itemizing specifically for ferals, even outside taking away our "niche" as the high-armor tank. Blue posts on druids keep including things like "but then you can't share gear with other classes." Well... so what? Introducing all the specifically feral items they did over the course of BC (with nice distributions of AC, agi, strength, stamina, and a little intellect for good measure) worked out great in my opinion. They turned out to be viable for both bear and cat. T6 is close to perfect in that regard, with its awesome set bonuses. Why ruin a good thing? Why try to shove furry animal-shaped pegs into square warrior holes? (Or, for that matter, pointy rogue-shaped ones?)