/devilsadvocate
But if someone starts at ME3, they're not going to have the same attachment to the characters as someone who has played through the first two games. Thane's death scene isn't going to impact someone who has never met him before the same way as someone who fought the Collectors by his side. Same for Grunt, Tali, Miranda, and all of the other characters who have possible deaths.
/enddevilsadvocate
It was disappointing that so few of your choices really seem to mean anything in ME3 though. In the end, virtually none of them seem to mean anything.