When using slow killing builds, I have way more problems with Garrus trying to run up and club things to death with his sniper rifle despite his lack of shields and DR, or Kasumi getting rekt because she just stares at the enemy after teleporting for a SS.
Those sound like console problems. Kasumi is an unholy terror over here, if you just wait in cover she'll kill everything herself except for YMIR mechs and gunboats. Haven't seen Garrus being stupid either, he'll at least switch to AR first.
Starting with ME2 you can usually ignore your squad, they'll do okay on their own. In ME1 they spammed their powers, then got shot in the face. Especially when you try to fight turrets, Thresher Maws and Geth Armatures/Colossi on foot. Shepard evades a rocket with a side step... and it hits Garrus who stood next to you. Even telling them to wait in cover didn't work because at max range you go out of combat the moment you stop shooting.
In the end (ME3) I just killed everything as fast as possible and didn't give my team a chance to get hit in the first place.