Hi, I have 700 expertise and had the chance to play against a top premade team on Civil War. The middle was virtually uncapped for the entire game and below are the results.
http://imageshack.us/photo/my-images/33/985k.jpg/
Below are my ranking of the strongest specs in general post-patch.
1. Vanguard/Powertech DPS
2. Guardian/Juggernaut Tanks
3. Commando/Merc Healers
4. Commando/Merc DPS
5. Sniper/Gunslinger
6. Scoundrel/Ops
7. Sorc/Sage DPS
8. Scoundrel/Ops Healers
9. Marauder/Sentinel DPS
10. Not too sure about anything else.
One of the key elements in PVP is the exponential effect of expertise for healers. Not only does 1% of expertise reduce the damage healers take, they also heal 1% more. So at 12.5% expertise, healers in reality become 26.5% harder to kill. Coupled with the Commando's already absurd survivability, they simply become gods. This is especially noticeable when Sage healers evaporate when focus fired.
Do tell me what you think of this list*.
*This list is not entirely applicable to Huttball.