SLAM is where it's at for arms, I never had it on my skill bar until lv 68 because how useless it seems but with a slow 2h wep, hits once every 3 secs at best, spending 15 rage to so an attack +100 dmg every half second+cd is brutal, then think sweeping strikes for PvE when you overpull, with a string of crits on 1 char you can keep over 1000 DPS.
In PvP it is a little harder, charge and then slam a squishy while they are stunned, but with rogues it is pot luck, .5secs is a long cast time but there is a chance by the time they jumped away they will jump back in front of you then BAM, mace to the head. If you want to PvE roll prot, you will get a group EASY and it's not tthat fun, takes more skill than most other jobs to do it rite and you learn the skill of marking targets.
I test all my shit on private instant 70 servers, and as such I have done serious experimentation in builds. I like PvP so I am arms fury. If you want to try PvE fury good luck, some people just don't take you seriously next to a rogue/mage/hunter for DPS.