Legion's sacrifice was definitely saddening, but I preferred that going complete Renegade and seeing him executed in slow motion. Any sort of confusion I felt about the Krogan (which wasn't much), was totally dealt with in my talk with Eve. I loved the moments shared by her and Shepard. You learn more about the culture and really come to understand what the genophage did to them as a people. Then again, I'm all about story depth. Can't be helped!