Depends on what you're going to do. If you want to PvP you should avoid Fury completely, you seriously won't even get a kill in most cases.
If you're going to PvE and raid Fury is pretty viable, about the same DPS as other classes ~5K, but youll still be losing to Arms warriors and hunters (then again, who doesn't lose against hunters in PvE).
So if you don't mind not being the best, you can always go Fury, it's a fun spec, but no Blood and Thunder makes you lose about 5K DPS on Trash compared to Prot or Arms and both of these specs also do better Single-Target.
And don't forget you need 2 of each to play Fury xD