I rather thought of it as the decision of an ending that suited a certain playthrough, one of loss, sacrifice and inevitable death. Since the 'stop trying to get the ending changed' is arguing that the people who didn't like the endings merely wanted a happy ending, I've asked around about why they liked it.Asita said:Because the ending pushes fatalism so far down your throat and so suddenly that you start to retch. In a nutshell, the ending did a spectacular job of robbing your choices of the impact the rest of the series promised they would have. No matter what you do: Villains dictate that you end the story on their terms, Mass Relays are destroyed, Victory Fleet trapped around a devestated planet, Normandy crashes on some unknown planet which they'll likely never get off of. Galactic Civilization dies with your final decision, and so too does the meat of your decisions...actually, I think I've made this argument somewhere before...ah, here it is.
Most players who approve of the ending have had that tone in their games, continual loss of companions, not just scripted losses (Kaiden/Ashley or Mordin/Thane/Legion), but things like losing Wrex, losing a large number on the Suicide mission in ME2, losing companions in ME3 and minor characters. Things that you can avoid and overcome in the game through choices. Those actions led to a fatalistic ending, Shepard dies no matter what, but he 'triumphs' over the Reapers.
Wheras most players who enjoyed the ending saved people, continually. They saved everyone, didn't lose people on the suicide mission, didn't lose Wrex, overcame adversity in innovative ways, talking down Saren at the climax of ME1, reasoning the Illusive Man into killing himself in ME3, solving the Geth/Quarian War, Curing the Genophage AND creating a more 'galactic friendly Krogan' by saving Wrex AND Eve. But then there is no ending that embodies the theme of triumph in the face of overwhelming odds that say YOU MUST DO IT THIS WAY, rather the choices of the player can lead you to a different conclusion, that every action in the galaxy has more than one way of approaching it, and in very unconventional ways as well.
The Mechanics of the game allow for, and in many cases encourage players to resolve things positively, but the ending doesn't allow for players to continue that theme. It only allowed for players who lost and sacrificed to win, not those who overcame and altered to win.