I guess maybe I don't place as much importance on plot twists as you do. Extremely simply stories can be very powerful (see, for instance, the aforementioned
Journey). In fact, I generally don't care about spoilers at all because my position on story-telling has always been that it should be a joy to experience a story even if you know the entire plot and all the twists and turns already. It's about experiencing the story as it happens rather than the bare facts of
what happens. So while it's true that none of the
Mass Effect games have had any mind-blowing plot twists, that wasn't something I really cared about. I think the story for those games -- so far as video game stories go -- was well-paced and well executed. Sure, it was kinda generic and predictable, basic heor's journey stuff. But the graphics were about as realistic as they could be for the time, the musical accompaniment was great, the voicework was great. I've always been a guy who cared more about gameplay in games than in their stories, or graphics, or presentation in general. But for
ME1 the overall presentation was greater than the sum of its parts, and it really swept me away as a story in a way that few games have ever done.