Concussion BlowFollow

Consussive blow is good but keep in mind that you can only stun a target 3 times before he becomes immune to stuns.Also all elite bosses are immune to stuns so it's a bit overrated if you ask me.

Actually I think that may be right. I have stunned an oponent a bunch of times in a battle with revenge then all of a sudden he starts to throw up Immune signs when I use it and won't get stunned again. Tonight I think I am going to try out that out.

A target will get immune to stuns for a short period after 3 stuns. You can wait the 20-30 seconds in a long fight and start stunning again. But as was mentioned most bosses are immune always which limits it's end game usfulness. I find it a fun and handy ability because it can be used in any stance for a 5 second breather.

some boss are not imunne to stun so try and youll see its always funny to get to a boss and find that out :) save some healing

I am a total Protec. Warrior, except for 3 points in Heroic Strike. Concussion Blow is awsome, because if you need someone to stop moving, theres no better way. Revenge spec't up is great too. And if your a Tauren like me, then you got Warstomp and that makes 3 stunning abilities. I wouldn't have it any other way.

I recently re-specced so that I have Concussion Blow. It rocks.

I disagree that it costs a lot of rage, though. This is because of my tactics, however. If my party is fighting the entire group of enemies instead of pulling them a few at a time, I will initiate combat by Charging into battle. I have Improved Charge, so this gives me 6 more rage than a normal Charge. So, I Charge in, the enemy is stunned for 1 second. I use Concussion Blow to stun for 3 additional seconds of stun, then I switch to Defensive stance. I toss on Demoralizing shout so that I gain aggro from all the enemies. By this time, my party is attacking the enemy I'm fighting and it dies quickly. Toss on some Shield Block, Improved Revenge, etc, and the enemy doesn't have a chance.

As for PvP, I have dueled a Mage (Mages are supposed to rule over Warriors in PvP) and almost won. If it was a real battle and not a duel, I would have won, I believe. This is because the Mage got close to me and would not allow me to Charge into combat. Otherwise, I firmly believe I could have beaten the Mage with Concussion Blow, Improved Shield Bash, and Intercept.

Gotta love it when they don't suspect that you're a protection Warrior!

Read the patch notes for the test server. Concussion blow becomes instant cast, and losses damage. But that will be really nice i think, no more waiting to see if it lands before the caster gets off their spell.

To elaborate somewhat on what other people have said on stun immunities and such:

As of a few patches ago, there are diminishing returns on stuns. The first you pop will work as normal but if you stun the same mob more within the next 15 seconds then you will see a reduced effect. Your 2nd stun will be at half duration, your 3rd stun at one-third duration and any subsequent stuns within those 15 seconds will be completly ineffective. This was done mostly to limit the power of stunlock Rogues but was, of course, a pretty horrible nerf for us Protection wars as well.

Charge having a 1 second stun component, instead of something like a 1 second disorientated/sap-ish effect, doesn't make things easier. My stuns are fairly insignificant as anything but spell interruption in any fight where I lead with Charge, and that's pretty much any fight where I can get away with it.