Oh, 3 has more problems then just the standard Bioware 3-choice ending scene.
Like, I'd totally guess the original storyline got thrown in a bin, then they just kind of retread a bunch of things (For the third go-around, no one believes Reapers exist, being the obvious one). Also the "Illusive Man" (already the dumbest name for a villain I could think of), goes straight from an actual anti-villain aand respectable foil, to straight up generic deluded evil prophet (and gets a cyborg ninja superman from somewhere to repeatedly show up like some anime edgelords version of Team Rocket.)
Then there's a bunch of fairly quicked fanservice checkboxes to quickly and abruptly resolve hanging plot threads with your companions, many of which should be galaxy altering events of themselves, but get brushed through in quick sidequests.