by Thrashing » Mon Feb 02, 2015 1:44 pm
The main downside of Arms DPS in raids is that Mortal Strike takes up a debuff slot that is better off being spent on something else.
Besides this fact, Arms relies heavily on having a single good weapon (Bonereaver's Edge from Ragnaros is, in my opinion, a must-have to even attempt proper Arms DPS). I have experience playing an Arms Warrior on Horde side with this weapon, and I have no issues keeping up with Fury DPS/Rogues. However, Arms is severely outperformed by Fury in the execute phase.
I can not reccomend playing Arms in a struggling/progressing guild, you would help your guild much more by playing Fury. However if you have the gear to support it, it's not that much of an issue when your guild is farming content anyway.