The Looks of the new Tier 0.5 Sets

[bonemage]

The Warrior set is darn near ideal when you consider current tanking and DPS itemization prior to raiding.  It fills holes in bracers and belt for tanking (how many tanks are doing MC with a green belt from a low-50s quest), and gives DPS options for AP vs. what exists now (almost all +crit gear, with fewer optiosn for +STR/AP).  When considered with the new smithing recipe coming in 1.10 also (Titanic Legplates), it looks like mixing and matching heroism with some other items will make for some overall significant improvements in both tanking and DPS gearsets.
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I do not agree with you here. The warrior set is a hybrid set, with DPS and a couple of tanking pieces. Perfect for a DPS/part time tank build, but it's poor for full time tanking, especially tanks trying to gear up for raid tanking. It's well rounded for a generic warrior, but is much too weak in the defense department to get a tank even close to where he needs to be for raid tanking. The whole set gives only +15 defense. The bracers are slightly better than the Fel Hardened Bracers, but that is one piece I'll surely get. The belt is a nice blue that is about like the Stalwart Clutch that I currently use, with 1 less defense and better stats, and, well, it is blue instead of green. An upgrade there for me, but I might opt for Deathbone instead. The legs are decent, but not as good as the Enchanted Thorium Leggings. I'm quite disappointed with Heroism. If Blizzard set out to make a hybrid DPS/tanking set of plate, make 2 epic DPS pieces, and 2 epic tanking pieces, not 4 epic DPS pieces, and 3 rare tanking pieces and 1 rare stats only shoulders. Then there could be some good mixing and matching with partial set bonuses for both tanks and DPS warriors, and put a couple of pre raid epic armor pieces in the hands of warriors in the market that Conc and Durambar are in. The full set would be generic but well rounded, but better with tanking than it currently is. That would have made both DPS and tanking warriors happy, in my opinion.

The new Deathbone set, which was clearly designed for "tanking pallies" with defense, stamina, and mana regen, is still better for warrior tanks than Heroism. Heroism does not have enough +defense to make up for other tanking blues that you'd have to give up to wear part of the new set. The best mix of Heroism for tanking would be bracers, belt, legs (the only +defense items) and the high stamina boots to get the very nice 4 piece set bonus. I would have to give up 11 defense over what I wear now, give up considerable armor, and for all of those slots but the bracers (no Deathbone bracers), the Deathbone pieces are better, even with the wasted cost of the mana regen. Also take into account the Deathbone pieces are easier to get. It would have been nice if the few tanking pieces that Heroism has are best in that slot for tanking blues, but only the bracers reach that status. If you take the new Deathbone, but convert the cost of the mana regen to agility and some strength, that would have been ideal for tanking blues in my opinion. I do agree that some itemization issues have been addressed by 1.10, but not by Heroism when it comes to tanks.

Caveat: This is operating on the assumption that the information currently available is correct.