So, after playing the ME trilogy all over again, I have to ask; What deaths, preventable or not, hit you the hardest?
For me, Samara's death was rather emotional due to the way it was portrayed. Most of the time where people commit suicide it was off-screen. Samara? Nope. Plain-up headshot with blood and shit everywhere. Hit me hard.
Saren's suicide too, for the same reason above, and the speeches beforehand ;_;
Finally, Legion's death made me cry like a little bitch, as did Mordin's.