Couple of things....
SC2 is being developed from day one as a multiplayer and single-player game. WoW added Battlegrounds and later Arenas after it had already shipped. That's a little bit about what Rob is talking about -- the difficulty we have had retrofitting WoW's PvP. I don't want to put words in his mouth, but I don't think he is saying Arenas were a mistake. It's the way we introduced Arenas that has continued to cause ourselves a lot of work and occasionally caused frustration for players. We like the Arena gameplay though or we would have cut it or overhauled it long ago. We do think we have shifted the PvP attention a little too much towards Arenas and away from BGs, and yes we understand that loot rewards are a big part of the reason why. We aim to fix this with Cataclysm.
Starcraft is also just a fundamentally different game. You aren't taking your campaign character into competitive multiplayer. In fact, there is no multiplayer character per se in the sense that you can grant your character more power over time. You start every map with the same base and units as everyone else. Starcraft also isn't going to change over time except for whatever balance or design changes the team makes. There is no equivalent to the new gear or whatever that suddenly shifts the balance of power.
We make PvP-specific rules when we think it's appropriate. Resilience and diminishing returns are two obvious examples. SC2 does the same thing. Not everything works completely differently between the two halves of the game though.
Tank Balance
On Sartharion +3, cutting-edge guilds who normally tank with a warrior would (perhaps somewhat begrudgingly) use a DK to tank instead because the benefit was so massive. The same thing happened on Vezax where good guilds replaced their warrior tanks with DKs. Death knights were overpowered at the time.
We are not seeing the kind of massive swapping one class of tank for another in ToC or the preliminary Icecrown testing. It's just not happening. If paladins or druids are too good or warriors or death knights aren't good enough, we're just not seeing them getting used for those fights to anywhere near the extent that DKs replaced other tanks on the encounters mentioned above.
As just one example (and I wouldn't put too much weight behind this), the number of paladin tanks used to test Icecrown on the PTR has been almost imperceptibly low. It's possible there were actually none this weekend, or else the numbers were so small that we missed them. Sure these are not the hard mode encounters generally being tested, and you can come up with your own explanations for differences between how players might approach PTR and "real" raiding. But these are the kind of lopsided datasets we have to deal with when we're looking at who is using what tank and how that relates to success.
I'm not talking about balancing around representation, as players often mistakenly claim. I am asking the question that I have asked before: if one or two of the tank classes have such a superior and unequivocal advantage in making a fight easier, why aren't more guilds using them, especially given the evidence that they have swapped tanks on previous encounters? I understand individuals of you may state it has happened to your guild. That's fine, but understand you are in a small minority. Overall, it's just not happening.
One conclusion you can draw (though certainly not the only one) is that whatever differences in survivability there appear to be "on paper," just don't make a significant difference in the actual fights, or at least not enough of a difference that guilds feel compelled to switch or are held back by not switching.
As an aside: there are some specific fights where the specific mechanics lead guilds to tend to use one tank over another, say a druid to tank Thorim hard or a shield-using tank on adds for Anub hard. Most players aren't as concerned about these one-off encounters because it feels like such an encounter-specific problem and doesn't feel like anyone's job as guild main tank is in jeopardy. (Individuals of you may feel differently of course.)
I know there are lot of threads on this topic right now. I avoided many of the ones that are doing a good job discussing numbers because I didn't want to derail them.
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