To some extent that depends how you look at it, I guess. Yes, Bioware gave all the options, but the story of Shepard and the Mass Effect universe was one the players told as well. Who is Shepard? Bioware never told you, outside the very broad strokes. Shepard is a Marine/Specter, you gave him a bit of backstory yourself that they'd pre-written, but he could be an asshole, a saint, or anything in between, based on how you envisioned him. Even when the lines he could say were exactly the same, the ability to choose why you were saying each in your own mind, and choose the internal tone you had for that line, was a big part of creating your Shepard.CaitSeith said:By design, the game experience is impossible without the effort of both the developer and the player. But Mass Effect story has always been told by Bioware, with outcomes already created for the player just to explore, not to create. The player's choices in Mass Effect 1 or 2 are limited to what Bioware decided the player could do. Bioware decided what effects each of player's choices would have on the story; the players can't alter the story beyond that. The only difference with ME3 is that the later was done poorly and more restrictive; and the ME3 was re-written at mid-production (removing the Dark Energy plot by orders from EA) long before release.
The problem when it came to three, was that that whole side of things went out the window. Shepard was no longer your character, he was Bioware's now. This is where the biggest problem with ME3 as a whole came in; it disconnected players from their characters, breaking one of the core attractions of the series.
There were a ton of other issues as well, yeah, that resulted from the rewrite - retcons all over the place, Deus Ex Machina, magical McGuffins, utterly nonsensical writing in a lot of areas...
But while it is the ending that is remembered the most, that was more just the straw that broke the camel's back. The game as a whole was deeply flawed from the get go. It managed some great moments, but that was in contrast to the several issues the game had as a whole with its writing, and the sidelining of the player's role in the game.
Its a bit of a shame that that's the ending the ME series got in the end. I wish games were treated like movies a bit more, and we could get a "Reimagining" of it in another 5-10 years time that actually makes it good, but I doubt that'll happen.