thats why i asked the OP if he was talking about pvp specs or is he talking about all specs in game.because there is a huge difference,some specs are not meant for pvp and never have been good in pvp.so you can not talk about them in regards to the "worst pvp spec".one could talk about them if the OP asked what is the least spec played regardless if its a pvp or pve spec.
yes arms is the worst pvp spec in game atm,and the warrior class as a hole is the worse class in pvp atm.#'s do not lie.warriors have no other choice but to run arms,its the pvp spec but its just broken atm.do you see fury and prot warriors getting glad?no.its arms or nothing.you seen the link i proved right?yous een warriors at 1% rep and guess what spec all thoese warriors are,thats right they are arms warriors.when you have one of the most played classes "warriors"with the worst rep in game,that tells you how bad they are .some classes like mages have more then one choice to pvp with.sure forst is the main pvp tree,but fire mages are dam good in pvp as well.see what im getting at?
what makes a pvp spec you ask?well that easy,its the specs that blizz designed for pvp and still do.like arms,frost mages,sub rogues,dis,holy pallys ect.see billzz does not make prot pallys a pvp spec because they make it for pve "tanking"and do not account for pvp at all.on the other side of that blizz will make sure holy pallys are good in both pvp and pve.take a prot warrior into arena and your not going to roll to glad with it.although sometimes certain class specs do end up being good in pvp when its not supposed to.again like prot warriors have been nerfed since wrath because of pvp reasons.
when did you start playing wow?back in the day blizz designed 1 tree for pvp and another for pve per class.now they TRY and make all specs viable for pvp and pve and thats where the balance problems come from "alot of them anyway"but even still,the traditional "pvp specs" are still seen by blizz as pvp specs and they design them better for pvp,example frost mage/arcane "we all know what spec blizz sees as the pvp spec for mages.sure one could play arcan and do ok in pvp in certain set ups,but the same player will get much better results by running frost in pvp.thats also the reason why frost is uauly behind arcan and fire in dps in pve.