I've just developed a new Marauder specs, trying it out and i think it's efficient!
Check it out : http://www.torhead.com/skill-calc#100ZGGroMbMzZGrzrzs.2
It focuses on armorpen, critical strikes, gapclosing and high damage aoe!
The most important skills are :
Obliterate ( gapcloser )- Jumps to a target, dealing 734 - 915 weapon damage and immobilizing it for 1 second. Strikes with both weapons if dual wielding.
Gore ( armorpen ) - Gores the target for 551 - 634 weapon damage and grants Gore for 4.5 seconds, which increases armor penetration by 100%. Requires two lightsabers.
Dominate ( Talent ) - Force Charge and Obliterate have a [33.34 / 66.68 / 100.02]% chance to make your next Smash used within 20 seconds an automatic critical hit.
Shockwave ( Talent ) - Each tick of Force Choke and Force Crush grants you Shockwave, reducing the rage cost and increasing the damage dealt by your next Smash by [12.5 / 25]%. Stacks up to 4 times.
Displacement ( Talent ) - Deadly Throw has a [50 / 100]% chance to immobilize the target for 3 seconds. Additionally increases the range of Obfuscate by [3 / 6] meters.
Smash ( Main DAMAGE SOURCE ) - Smashes up to 5 enemies within 5 meters, dealing 714 - 779 kinetic damage. Also stuns weak and standard enemies for 1.5 seconds.
Ravage ( Main DAMAGE SOURCE ) - Performs a series of lightsaber attacks that deals 1026 - 1162 weapon damage over 3 seconds. Standard and weak enemies are additionally stunned for the duration of the effect. Strikes with both weapons if dual wielding. Cannot be interrupted.
And here is my footage of this spec :