So far, 3.0 has been pretty good to protection warriors. We haven't seen any huge overhauls, I'd I've felt like my protection warrior has never been better at tanking bosses, trash, and even PvP.
There are only three things that I would say need to be addressed. One isn't a huge problem yet, but will be. One is a decent problem that needs a little bit of mechanics tinkering, and one is just a "quality of life" fix.
Competitiveness in Progression Fights.
This is pretty big. Sarth+3 highlighted a weakness of warriors (and paladins) - huge spikes of (magic) damage. I wasn't too worried about future prospects, though, till I started reading some Tankspot Community articles, which developed into a dialogue with some Dev's on the WoW Forums.
What it boils down to, is that DK's high cooldown availability gives them a large advantage. When your undergeared, you take more damage. This makes damage spikes (more) lethal. Having more, low-cooldown abilities lets DKs cheat death in more situations, more often. Their CDs also help deal with magic burst, which while they not new (every dragon breath ever), have never gotten close to one-shot levels.
Feral druids are also rising in attractiveness for progression tanking, as burst damage is pushed to the point of one shotting warriors/paladins. Feral druids will always have more EH then warriors/paladins, and thats fine - until developers push damage closer and closer to the point that warriors/paladins get one shot, in an attempt to make physical damage to ferals/CD-poped-DKs non-trivial. Sarth 3D gives the impression that future hard mode bosses will use this method of raising "difficulty" as well.
Patch 3.1 does offer some hope, in the form of Glyph of Shield Wall. It, along with improved disciplines, gives us a 40% SW on a 1 Min CD - at the cost of talent points and a glyph slot. If this makes it live, it will be one step in an arguably right direction.
Inverse Rage Scaling
More avoidance reduces the chance you get hit. Rage generation gets spotty, and threat drops. This went on all through BC, but there was a light at the end of the tunnel. We had talents in prot and arms that granted rage on a dodge/parry/miss - but they were all phased out over time.
The only thing that made it to live was Blessing of Sanctuary. 10 rage on an avoided hit made rage/threat bearable, though the difference between warrior tanks that had it, and ones that didn't, was large.
Patch notes for 3.1, though, show that BoS now only gives mana - severely nerfing it. Some compensation (talent or ability) needs to pick up the slack.
The amount of key presses needed to insure 100% HS usage is insane. While less then 100% in unlimited rage situations is passable, it will be sought after by serious tanks for top performance. A toggle for HS would be one solution with a minimal impact. A cooldown (~4seconds) would also work, provided there was an equitable trade off for the frequency loss.
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