I agree with this post , those who are interested in pvp should post here.
I play as a Guardian vigilance specced (mainly dps/sometimes tank).
Now the first thing to know right now is that the Empire's strenght consists only of teamplay . Countless times I have defeated/seen defeated a sith one on one regardless of my level or his/her level.
Though as I said , teamplay is the key here, but PVP got better since the patch .
As I've seen in the pvp right now (valor rank 23 here currently) the major Empire teams are The Sovereings and Odium Prime (which are easy to beat in 1v1 , but hard if they gang up on you, as they usually do.)
Only republic guild I have seen doing pvp competitively is Legio Feratta or some such, so I recommend those who want/can pvp band up and show the imps how you really play
Also Skype or Ventrilo would be helpfull in the future!