
Some of the ending differences, as I understand them, are whether the working crew is sacrificed, which/whether team members were sacrificed, whether Shepard destroyed or kept Reaper technology to be studied, and whether Shepard died. Here is how it went down, almost entirely due to metagaming:

- My crew was sacrificed. Because of assumptions born from playing other games, I waited to collect all of my team members assuming it would be possible to rescue them later. Interestingly, even if I had believed they would all die, I would still wait due to my completionist compulsions and my preference to experience gameplay (team member missions) over cutscenes (acquiring crew), assuming that would be the primary difference in experience. Also interestingly, were I making a strictly roleplaying decision, it would be to rescue the crew with fewer team members.
- Jacob and Grunt died. Because I assumed the game would sacrifice characters I most liked (this was my interpretation of the events of Mass Effect (1)), I chose Jacob and Grunt partly because they were less socially interactive, and mostly because I rarely used them on missions. If I believed it were possible to not lose any team members, I would more-likely have made decisions from the point of view of Shepard instead of a metagamer.
- Shepard kept the Reaper technology. Because I was on a renegade bender, I chose the "renegade" option of keeping Reaper technology for use by Cerberus. There is a small chance I would have chosen this even if I was role-playing since they did a poor job making a case for this being a "renegade" decision. It seemed reasonable that taking Reaper tech back to Cerberus for study could be useful against the Reapers, its risk mitigated by the fact that I can destroy a half-complete Reaper with my pew-pew pistol.
- Because my actions were mostly good, Shepard survived. This is the only result that certainly would have been the same if I had role-played all of my decisions throughout the game.

Actually I've read that the only way for Shepard to die is if only 1 or fewer members of the team to survive, in which case there aren't enough to pull him up from his jump to the shuttle at the end. And that creates a save you can't load in ME3 apparently.
ReplyDeleteMostly whether characters died is based on which tech upgrades you got on your ship and whether you did their loyalty missions. Some of the choices for who to send for a specific part of the mission will kill people off even if they are loyal, and sometimes it's possible for someone to survive who isn't, but that's the general gist of it.