Banned for making me think of the cliche mobster line: "do you think this is all some sort of game?!?"
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Vingry: Yep, it turned out I got the default ending, where I wasn't given the choice to either shoot the Dark One or the laser thingy. And, upon looking over the guide on how to get the alternate ending (the one with the decision making) and realizing the many subtle details that I should've paid a lot more attention to during the missions, made the whole experience more frustrating. I mean, even during my first playthrough, I did try my best to not rush the game to discover the secrets that the game has to offer to a point that I felt bad for the NPCs for waiting for me.
Dunno how that happened...afaik all people got the same ending choices. Still, just watch the ending videos if you still want online to save time and not have to play it all again.