We don't need more ability pruning. We have almost no abilities that don't have a valuable role in some facet of the game. (throw is pretty much it)
Like many others in the thread have stated, our less useful abilities just need some tweaks to become super amazing things we look forward to using.
Berserker stance is only useful for a dps warrior in pve for aoe damage. The reason for this is that you have to take an ass-ton of damage to get enough rage to even USE an ability, let alone use an ability that's worth spending that much health on when you could be in defensive stance. The way to fix this: increase the ratio of rage gained per percent health lost by a factor of like 3 or so. That way when you tunnel the warrior in 3s, they get flooded with rage and they punch you in the face. We're supposed to be the durable, ignore pain, get angry class and currently in pvp we just fall over. Berserker stance would be even more rewarding in pve as well since you could trade some lost health for big damage, rather than the 1-2 heroic strikes you get from a tortos stomp now. also, maybe they should change it to give you rage over time (3-5 seconds) so you don't overcap and you get this few second long period of lots of rage to burn through.
I honestly preferred the vanilla/tbc method of active mitigation that was shield block on a low cooldown, low rage cost, and you just used it any time big damage was coming. I thought threat generation was more interesting of a mechanic than the current active mitigation, but i know i'm in the minority here so I won't push it.
You guys keep saying that we need a thrown ability to make up for time we can't attack the boss. I would argue that instead of being able to use a mediocre ability at range, they need to buff our melee damage so that we outperform all these other classes while we're in melee, with a heavy punishment for being out of melee. This would make us feel like the true melee, weaponmaster and we would be slightly ahead on fights in which we have 100% uptime.
DPS warriors have no niche. Blizzard nerfed it in cataclysm, saying that incidental aoe from whirlwind causing fury warriors to excel on multi target fights was unfair, then they turned around and let frost death knights and rogues do it. More recently warlocks gain tons of single target damage from aoeing, meanwhile, we use a 30 rage whirlwind and cleaving raging blows to do middle of the pack aoe, don't get me started on how weak arms and arms cleave is. Also, please make the actual ability, Cleave, worth using like ever.
Prot warrior mechanics allow for good dps on aoe, they just need numbers tweaks. On single target, I'd say adding heroic strike into the rotation with a boss debuffing mechanic that lets you use it for damage as well as dmg reduction would put us more in line with dps geared monks and prot paladins.