Arms is not worth playing in pve dps. the only time i would ever consider doing it in its current form was prenerf garalon when you got extra damage from sweeping strikes. in every other situation you can do way more dps as fury. I went arms to try it after I got heroic starshatter, and i did a whopping 83k dps on protectors of the endless elite, which was rank 76 in the world since no one plays the spec. If i had needlessly meter padded with sweeping strikes I could do way more, but it's pointless. Besides, fury cleave is just as good, if not better than arms.
I am not saying i played perfectly, but I had respectable ranks in dragon soul when arms was actually good, so I've had success with it in the past.
http://worldoflogs.com/reports/rt-obj99vk23jrjwice/ arms best
http://worldoflogs.com/reports/rt-g5...?s=6598&e=6997 fury best
**on topic** fury's dps is easily competitive with the other top classes, aside from fire mages before the nerf.