I actually think the synthesis ending is more supportive of the organic & synthetics can't live together peacefully argument.as it makes you fuse all living beings (synthetics included here) with synthetic and organic components, siting it's the only way we'll all get along. destroy never makes this argument, in my opinion.
Sonofa. They made 3 endings in which all of them are good and all of them are bad, all successes, and all failures.
To be honest, that's what I love about the endings. So many times in the game, renegade or paragon choices are amazingly clearcut and boring. And there's things like punching the reporter, that are just hilariously mean for no good reason. But the damn endings are a bit more morally complicated.
Even if the original presentation was godawful to put it mildly.
That's fine. Again, I have no beef with this [ubermegaultra]darkness. I'm more annoyed by the automatic responses during the conversation. "There has to be another way" Heh, as if I cared if there was at that point.
It is further complicated by the fact that Synthesis is only an option if you have high EMS. Does this mean Synthesis is the "best" ending? Typically in video games if there is an ending that is harder to achieve, that ending is supposed to be considered the "best" ending. So this implies that Synthesis is somehow superior to Control and Destroy.
I think in retrospect BW would do a few things differently. It was probably a mistake to color-code the choices, as I don't believe they really intended there to be a Paragon/Renegade/Paragade choice structure. They probably just wanted visual differentiation so that the player knew which to walk towards after the explanation ended (which as it happens didn't work for me. I started walking towards Control before realizing it wasn't Destroy, tried to walk back and the world went kaboom).
I also think they should have spread the choices equidistant around the platform in triangle formation, instead of Synthesis being in the middle, which is usually the indicator of the optimal choice.
Hate to say it, but I think the "space Jesus" aspect of the ending is actually one of few things about the ending that has some basis in what happened before. The whole game is basically showing every species at its weakest, its most narrowly self-interested, most venal, etc. The Krogan hold the war effort hostage to a cure for the genophage, the Asari are revealed to have concealed their knowledge of a Prothean beacon from the other species, etc. Basically, we're getting at the whole idea of grace: Shepard is saving the galaxy even as the denizens of the galaxy are giving reasons why they're not worth saving. It's pretty much the same thing that was done in The Dark Knight Rises, and countless works before. Not the most original development, but I can't say that it's out of the blue either.
It's not out of nowhere, that's for sure.
Certain choice paths provide more basis though. Overall. (There's some scenario differences that work, but I'll be listing overall)
~~~
Synthesis:
-As many characters alive as possible, period
-Genophage Cure with Wrex and Eve
-Rannoch Peace
-Paragon towards most, but maybe Renegade towards those who outright stand in your way (except Reapers)
Biggest point is that Synthesis overall state comes from playing a lot, and having an import with a more specific path to things. Metagaming to win.
~~~
Control:
-Many characters alive as possible, but some deaths allowed
-Genophage Sabotage with Wreav, possibly convincing Mordin/Paddok to walk away (Paragon or Renegade persuade)
-Rannoch Geth
-Paragon overall, though RP room to be Renegade
Biggest point is that Control overall state is for those not willing to leap into Synthesis, or who haven't done quite enough to open up that path (considering Synthesis requires the 2nd most EMS). More paths lead to here as well. Gaming to win 
.
~~~
Destroy:
-Some characters alive, but some significant deaths
-Genophage Sabotage with Wrex, or Genophage Cure with Wreav?
-Rannoch Quarians
-Renegade overall
~~~
I'll put Breath Destroy as separate here, as it seems different to me:
-ALL characters alive
-Genophage Cure with Wrex (the clearly more naturally written end to this arc)
-Either Rannoch Peace or Rannoch Quarians (Rannoch Geth may work, but since I'm going with 'all alive'.... I want to keep Tali)
-Any morality state, but likely at least Renegon, Paragade, Renegade.. not really FULL Paragon
Control tells us that the organic-synthetic problem is insurmountable, and only by having a Big Brother ruling everyone can we be kept from destroying each other. It's Peace by the Sword.
Tell me, do you feel oppressed by your local police force?
Uh, It's not Paragon/Renegade/Paragade.
It's Paragon/Renegade/Something New.
It's green.
It's 'optimal', but only in a certain way.
What else do we see green with?
It's not Paragon or Renegade anymore. It's not even SHEPARD anymore, well, mostly. It's a new path, a new future.
Destroy - Memory and Spirit in the Body (breath scene...)
Control - Body and Spirit in the Memory (Shepalyst scene...)
Synthesis - Body and Memory in the Spirit ("and we will remember Shepard.")
Up til ME3 in the MEU, the Green/Life/Dream/Transcendance path for lesser organics and synthetics was largely locked away.
However, in ME3, if we game things right (EMS + certain scenario resolutions), then we can get this ending, and judge for ourselves whether we find it beautiful or against everything Shepard first stood for.
The Blue path of ME2-3 is something somewhat new as well, since the Paragon of ME1 was still very damn strongly in the 'destroy all dangers whenever it poses a threat' opinion.
But in ME2, we learn the synthetic perspective (though still reject the Reaper perspective), and only destroy the Collector Base because on the face of things, that choice is the clearest way of saving lives, whereas keeping the base would be used only to fight the enemy (as far as Shepard knows). Then in ME3, worn down by death and loss, the Blue/Paragon Shepard then picks the path that appears to save the most lives again. Human and synthetic lives. Not some new transformation into something different 
Green means change!!? Change is horrifying! I don't like change because it is different and I'm insecure!
Cut down the Rainforest faster before Synthesis comes for our Nans!!
And to me how you win matters as much as winning.
And tacitly going along with a "solution" to a problem I do not believe exists darkens all the choices.
You don't necessarily have to believe in the Catalyst's problem to enact a solution to your problem. I wish the game was much, much better at defining that. It's why I hate the ending. It's so undefined.
Otherwise, I think your own problem is kinda lame. You aren't willing to sacrifice or destroy what's necessary to accomplishing your goal.
Looking back, I'm actually alright with the ideal of not having the ending be an 'easy' ideal. The sadistic choice of destroy is downplayed for me because I'm perfectly fine killing the Geth and EDI to get to my desired end-state. My issue with Destroy is over the Mass Relays, and I headcanon that most of the major ones are rebuilt in a matter of months.
I'd still change the motivation of the Reapers since much better served as being hyper-advanced technological space-nazi's than they are as a meta-crisis solution acting in the prevention and establishment of the singularity. Granted, I'd have really only had one 'good' ending, and that'd be destroy.
Green means change!!? Change is horrifying! I don't like change because it is different and I'm insecure!
Cut down the Rainforest faster before Synthesis comes for our Nans!!
Woohoo, straw man argument and appeals to ridicule all around! Argument is fun isn't it!
Destroying EDi and the Geth isn't sadism. You do not derive pleasure from the act, it is an act of necessity.
In the end...
ESPERANZA SHEPARD, QUEEN OF THE REAPERS.
And then Shepard won. Forever. >>
I mean. Something serious. Yes.
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