I must say I absolutely despise this mission. I cannot for the life of me get even close to destroying the Warbird before I get wiped out. Any ideas on how to beat this thing? I've lost track on how many times I've died. Help!!!
The Sithesh is one of the few NPCs in the game that actually provides a challenge to almost every level of play (Not counting end game with STF gear). It's also the most complained about NPC due to the difficulty of beating it.
Three big things you have to worry about with the Sithesh.
Get yourself polarize hull to get away from tractor beam
Stay far enough away that you have time to destroy heavy plasma torp spreads, use beam array fire at will, or turrets as they fire much faster than anything else, or use torp spreads to kill them.
Use brace for impact for the massive plasma torp spread he'll fire at you, it will greatly reduce the incoming damage.
Use tractor beam yourself if you can to lodge him into a single spot and pound away on a single shield quadrant. Some will say that if you sit to his left or right flank, he can't torp you, but this is somewhat difficult if you're using a cruiser. Be above level 30, that's one of the biggest things. Any ship below 30 won't stand too much of a chance. I tried with an Akira and got mopped around so much, I gave up till I could get a defiant at 30.
You only have to push the Sithesh down to 60% or so in the initial 2 encounters so if you can do this without too much trouble, you can finish it off on the third.