I'm going to ignore the "if you don't understand the endings, it's because you weren't paying attention" intro for the sake of my blood pressure, and just get down to it.
Syrellaris wrote...
1) Synthetic life gets created by organics to serve them and make there lifes happier. When this goes awry, the synthetic life forms manage to gain some sort of VI intelligence and become a swarm. This swarm gets tired of being slaves and rebels.
You see this with the quarions and the Geth. Legion even explains it to you in ME2 and ME3. He also explains why it happened and what his solution to it is. He even goes as far as applying his solution or trying to at least. This one of your major plot choices. Effect is shown inmediatly.
That's not what happened to the Geth, at all. They didn't "get tired of being slaves". They didn't even immediately fight back when the Quarians opted to wipe them all out. They
eventually became hostile when it became clear their creators had no intentions of letting them live, and drove them off world in the interests of letting
them live, too. Not. A. Rebellion. Say it with me.
I mean, heck, after you achieve a truce between the two, the Geth
openly offer to help the Quarians adapt and settle on their reclaimed homeworld.2) The fallen reaper even explains it in detail, though cryptic. You (as shepard) do not understand the complexity of the issue and why they are doing it. YOu get this explained later on in the citadel by the catalyst.
He explains it very carefully that synthetics will in the end, always rebel against the ones that made them and do to there superiority, will win the war against the organic life forms.
The solution to this was creating a hybrid. This is what the reapers are. They are organic / synthetic hybrids. As he explains you are partially synthetic. A cyborg if you will.
Besides the problem that none of that is backed up by any of Shepards experiences with synthetics other than the Reapers, so what. At every single other point, Shepard has responded to Reaper claims by telling them to screw off. The chatty one in ME3 is met with a
precision orbital strike. I don't criticise that the apparent creator of the Reapers spouts the same nonsense as its creations. I criticise that Shepard just meekly goes along with it without question.
3) The three choices are exactly that. The destruction option resets the cycle. Organics stay alive and all synthetic life forms die out. It is now up to the organic lifeforms to ensure that future generations will not make the mistake of creating synthetic life. Which they will and the cycle repeats.
The Control option is a balanced solution. You gain control of the reapers and thus can keep them away from organic life for good. The decided outcome is simple. If you united the Geth and Quarians. They are your proof they can live together. but for how long? Are they up for it?
the Neutral option or..Synthesize is an option you take when you believe organic and synthetic can life together with forced materials. fusing Synthetic and organic DNA. A new life string as the cataclyst explained it. You are the living proof of how that works out.
If you payed attention to the storyline, you know Cerberus revived you using Reaper tech. Hence why you are classified by the catalyst as partially Synthetic. Why? The videolog showed it. the doctors purely said that with everything they had there disposal they cannot revive you as you are clinically brain dead. Yet Lawson found a way.
Again: there's been synthetics in the setting for over three centuries. There's precious few signs of this supposed 'inevitable rebellion' to go on, other than the word of the Star Brat.
Honestly, I'm not sure what you tried to do there. Explain the three endings via description? That's not the issue. The issue is with having Shepard take the word of something s/he really ought to be challenging rather than just accepting the flawed premise, and do one of three things: destroy all synthetic life (which I'll go with), control (which I personally just talked the Illusive Man into shooting himself for when he tried and failed to do exactly the same), and synthesis (which has you fire... space magic that rewrites everyone's DNA to be part synthetic. Which completely turns the very meaning of life on its head. Possibly for all time). And then everyone gets the same cutscene with different coloured explosions. It's three different endings portrayed in one near identical way, and is effectively utterly removed from everything else that we do.
For the record, I paid attention to the story, thanks. If I didn't, I doubt I'd care about all this.