The final fight in this mission is kicking my ass. Are you actually supposed to kill all the enemies or move down into the room and get thru the door to the shuttles? I ask b/c it seems like those damned combat engineers keep respawning and putting down turrets. If I'm supposed to clear the room, I'd appreciate some advice on how to do it, b/c i'm getting shredded in this fight.

FYI I'm going w/ Vanguard Shep along w/ Liara and Garrus. Impart your wisdom, peeps.

You just keep moving up or I think they keep respawning. Cheap shit, I know, but keep moving forward. I went to the right, up that ramp, took out the engineers, then the turrets, all the while watching my ass.

I also had a hard time with that stage, being Vanguard is worthless in that encounter (I am also Vanguard). What I did was to stay in cover as much as possible, and not move around too much. This will be hard because the Vanguard is built to move around, but with those turrets you'll die so quickly if you do.

So some obvious tips, focus engineers and not turrets. Engineers can repair turrets and place new ones, so focus them. If you need to take down a turret you can use your biotic charge + nova. This is pretty effective, but leaves you VERY naked without barriers and hurt from the turret explosion.