Hi,
I do fury pvp since vanilla and I must say it was never in a better state than now. Althogh you can reach a 2k+ rating in arena right now, I think fury suffers too much from various problems. I did a very long post on the official english Wow-forum (Link:
Fury PVP - Constructive feedback - Forums - World of Warcraft), in which I gave contructive feedback and some suggestions about fury pvp.
The major problem I see in arenas is, that your damage reaches from non-existend to very high burst. The reasons I see are
the exponential damagebuffs, the uptime of enrage and the rage-generation.
An example: If you choose to play fury, you gain 10% damageboost from dual wield specialization and 10% from berserkstance. Instead of 100% damage you now deal 121%. So what happenes when you are popping death wish? Death wish gives you a damageboost about 42% (with mastery-trinket popped). Now the 121% multiplies with 42%. Thats about 171%. You see what I mean? Instead of 42% more damage you gain 50%. And the more mastery you are stacking the more it is exponential rising.
Without the enrageeffect fury wars hit like a wet sponge. Neither can we use our talented Raging Blow, nor can we get the damageboost, which would make us doing moderate damage.
It is just punishing when fury wars have to hit the hardcap for hit to get a sustained rage generation. Fury is the only spec in the game, whose resource generation is linked to the hard cap of hit. In PVP gear it is almost impossible to hit this cap. So for fury, you often stand behind your target and wait to get some hits to get that killing blow.
Another point is, that after the next patch it seems, that if you want to play effective pvp as fury you are forced to skill Titans Grip, because of that heroic strike change.
As for the moment in 3on3 arena you could say, that you have better chances with a 3-DD combo. I did a ~2100 rating with a ret-paladin and a shadow-priest. The main tactic here is to burst someone down and cc the healer, if present.