Well apart from Jack, all the members were loyal to me...This was because I sided Miranda on their fight.
And yes, I did not even activate Legion when I was doing the suicide mission, EDI told me it was near the ship's core, so I gave up when I did not find anything near it. I found and activated Legion later after I found its location through the internet.
And yes, Thane, Garrus and Jack died during the sequence of Normandy reaching the Collecter ship during the suicide mission.
This was my line-up:-
Vents: Mordin
Fire Team: Lead by Miranda at first, later on Jacob
Escort: Grunt
Barrier: Samara.
Tali was compromised, and I think I left her and Samara into guarding the door.
[Edited by HonestGamer, 5/24/2010 12:27:00 AM]
pls click on the link in my previous post if u haven't already. and if u have all their loyalties intact..no one will die. make sure u have all ur ship upgrades as well. do another play-through and try and gain as much paragon as u can and the link i gave u has the best possibilties to make sure ur entire crew survives. i've done about 10 play-throughs with no one dying.
Yes, upgrades are also very important, most importantly those you receive by talking to members or that get added when you complete their loyalty mission. Most important are Jacob's ship armor, Garrus' thanix cannon and Tali's deflector shields. Just for safety reasons, upgrade everything, leave no upgrade un-researched. Use the trainer if you need to to get materials or probe the planets either way is fine.
Don't rush to finish the missions, take it nice and slow, check everything there is to check. I've read that if you go without loyalties and upgrades you get the "Bloodbath" achievement. (jk)