Did you stick to your first run for ME3?
I went back and did a perfect ME1-2 to prep for 3 and kinda regret it. Wrex survived ME1 in my first save but Thane (not a big deal) and Legion (BIG DEAL) died on my Suicide Mission.
I'm still kind of amazed that without reading any spoilers I managed to get everybody out of the Suicide Mission on my first try.
Well, Kelly and bunch of the crew got liquidated, but no squad members died.