i played about half of me1, all of me2. and i got the original ending, downloaded the game when it first came out, and nothing else. i was expecting some abysmally disappointing ending and yeah, some parts of it don't jive with me but when i consider the epic (and i mean FUCKING EPIC, like hundreds of thousands of years, maybe millions of years of history, being changed in that one moment) scale of what happened, i'm not surprised and not disappointed.
also i think it's a damn good lesson for life. you always have freedom of choice, but you can't bend the outcome to your will. ultimately you have to make sacrifices, and you might not end up where you expected. some things are out of your control, but you do still have a say in your own destiny.