ALL: I don't think I posted this here yesterday, but apologies if I did. I'm posting it now because I think it ties back to some previous comments about "art" and the poor quality of the ending narrative being considered a defect:
In looking more closely at the content in the core of the story resolution, I think one thing that's problematic is the fact that it becomes very difficult to keep on suspending disbelief. I think that's mainly due to the fact that the narrative becomes a continuous sequence of tired tropes clumsily strung together. The "trope density" is off the charts. A quick (not neccessarily definitive) analysis is below, with each trope linked to a description from tvtropes.com:
[...stuff happens and...]
Shepard is, for the first time, introduced to a
Sufficiently Advanced Alien, an
Energy Being who, to take
A Form You Are Comfortable With appears as an
Adorably Precocious Child. This being, an ancient
Artificial Intelligence, explains that he has seen so many
Robot Wars across the millenia that, in an attempt to resolve the situation, he developed a
Reset Button solution. In doing so, however, he has become a
Well-Intentioned Extremist who sees the struggle between organics and synthetics as an
Order vs Chaos problem in which his role is to restore order. His solution, creation of the Reapers, required him to
Jump Off the Slippery Slope and accept that
The Revolution Will Not Be Civilized; the most advanced civilzations will be periodically "processed" by this
Horde of Alien Locusts to short-circuit the
Robot War cycle.
After explaining
I Did What I Had To Do (which may qualify as a bizarre twist on the
Hannibal Lecture), the being claims (in a lightning-fast
E = MC Hammer moment) that Shepard's presence "changes things," and presents him/her with a set of
Final Solution choices. Each of these choices casually demands that Shepard cross his/her own
Moral Event Horizon by presenting catastrophic variations on an
End of the World As We Know It solution initiated via a
Big Red Button Self-Destruct Mechanism.
In an act of
Heroic Sacrifice, without a word of questioning, objection, or realization that "
I Forgot I Could Change the Rules," Shepard selects an option and ends the trilogy with a
Dying Moment of Awesome.