PvP is rarely ever decided by someone’s long term sustained dps though. It has a lot more to do with making the right decision at the right time.

In PvE there is no question that Shred is superior, but in most fights you can Shred. Those few fights where you can’t Shred aren’t ubiquitous enough to feel like a big deal. If you just find it too difficult to always get behind a creature to be able to Shred, then I’m not sure what to tell you. We don’t think this problem is so widespread that Ferals are at a huge disadvantage overall. We agree that Feral has a really high skill cap in Lich King, but that’s more do to the John Madden nature of the rotation than to Shred’s positional requirement, and it’s also something we’ve taken steps to improve in Cataclysm.

Many specs can’t perform their highest 100% potential when mobs are moving or when they have to step out of the fire, but we aren’t about to change those in order to make things easier on the player. I think raiding is plenty easy to be honest, unless you’re talking about the more challenging heroic-mode encounters in which, yeah, we’re asking you to step it up a little. (Source)