Updated Sun, Oct 09, 2011 by Messiah
Warlocks get one set for all specs similar to other pure DPS classes. Their 2 piece set bonus is all about your demons and since Demonology is so strong already, this looks to make them even better. Even though non-demonology warlocks will get a longer uptime, demonology will end up with more of a DPS gain. The 4 piece bonus is only so-so turning soul burn into a short term spell power boost, and making soul fire with soul burn essentially free since it will return the soul shard. Overall the 4 piece is pretty poor.
Warriors get two sets one for tanking and one for DPS, and while the tanking set has some good bonuses, the DPS ones need some work.
The tanking 2 piece set bonus is very similar to the Paladin set bonus, in that it grants a damage absorption shield on an abilities use. While it may not be all that exciting this is a great ability as it is an increase to your survivability, where many tanking set bonuses only grant extra damage. The 4 piece bonus grants bonuses to the raid and nothing to you. This is the same as the other tanking 4 piece bonuses and rather odd. This just makes it very clear that the tier 13 raid will dish out lots of AOE damage and that the tanks will be expected to help mitigate a lot of that incoming damage.
The DPS set bonuses so far are fairly weak especially for Arms warriors. The 2 piece bonus reduces the cost of Heroic Strike, however since arms tends not to use Heroic Strike it doesn’t add up to much unless you change your rotation. Since Heroic strike is weak, that’s not a great idea. The 4 piece is even worse not granting much of a DPS increase at all. In fact many warriors are saying that both set bonuses add up to less than a 1% DPS increase, while most set bonuses grant someplace in the way of 3-5%. Hopefully this gets changed before release.