From what I understand, arms only has the cleave-lead because of sweeping strikes which is only 2 targets so with the recent raging blow buff and the fact we can hit 4 targets with our raging blow (3 ww procs) does fury infact out-do arms when there are this many or more targets around?
Also, are there any fights where arms out-does fury in effective dps (like, I don't really care about how much dps I do to garrosh adds in p1 as they die anyway) as I can't really think of a fight where id rather be arms than fury.