I have no problem with transgender (as long as people are nice and show respect to each other) but there are people who believe your "playing god" by physically changing yourself and asking them to accept you is asking them to change thier religious beliefs (which maybe they should). If you always felt you where a girl in mind and spirit maybe that was a job for a psychologist not a surgeon.

actually if you havent played arrival it says in the galaxy at war map that the 103rd marines blew up the batarians. You lost your command because you worked with a pro human terrorist organisation (unless ofcourse you did the dlc in which case its the whole batarian thing)

The whole game was the "ending" as far as i gathered. All the choices you made in ME1-ME2 made a massive affect on how events played out in ME3, who lived to see new world and who didn't, what allies joined the fight and how you dealt with century long rivalries that could be fixed. All those choices had an impact on the force you built and in turn wouldve impacted Shep. SPOILER which is why Shep was the best choice for the synthesising ending as his experience of creating peace (and essentially building the biggest allied army of races) made him/her the basis from which all biological life would be "upgraded". Basicly the choices from all 3 games are what allowed you to get the synth ending, but the ending is all the events of me3 not just the last 2 mins