Way, way too many to elaborate on now. But my main gripe was how the plot didn't focus on the Reapers and instead opted to focus on Cerberus, leaving the former as a stagnant, boring force- defining ME2 as a completely irrelevant side story with no importance to the overall plot, abandoning what little ME2 actually did (in the form of Harbinger), and setting us up perfectly for the ending disappointment. Of course the endings would be total garbage, they changed the plot (which you don't do in an ending, it's not proper narrative structure based on Freytag's analysis to do so) back to the Reaper focus and tried to advance what should have been done in a 30 hour game within 10 minutes. And if you'd like, I can send you some analyses of the ending, shedding light on how poorly constructed they truly are. Of course, it seems you, like many others, have taken your own subjective interpretation of the events, and I can respect that. Indeed, it's why I'm hesitating to give you the videos at this point- I don't want to ruin your experience by pointing out the objective narrative and scientific/philosophical flaws behind them.