Lizardviking wrote...
ElitePinecone wrote...
Lizardviking wrote...
Or they forgot Saren's character.
It would confuse everyone who hadn't played ME.
But... choosing exactly what we'd been working to avoid in the first game does seem a little like narrative ridiculousness.
(Heck, Saren almost gives us more information about synthesis than the Catalyst)
Did you even read my first line in what you just quoted? 
I wrote something else then got confused and bleh.
My point was that I think it's closer to your first point (Saren is too confusing to new players) than just 'Bioware forgot Saren existed'. We know he showed up in ME2's Stolen Memory (with appropriate gags), but... it's frustrating that nobody in ME3 ever mentions that his goal (or his indoctrinated goal?) was actually organic-synthetic synthesis rather than just being 'lol evil Reapers'. As in, he was as self-righteous about it as TIM. Saren is practically the best reminder for players of the theme of organics v synthetics that ME banged on about in the first game, but we hardly know he existed by 3.
Even apart from the technical details of synthesis-via-Reaper compared to via the Catalyst (and go on, someone ask Bioware to explain how glowy green waves achieve anything material? Or how new species are made? How organics become partly synthetic, or vice versa? What is "a new DNA"? Or the final stage of evolution?), the ethical problems inherent in one person making a decision that irreversibly alters all live, everywhere, forever are... monstrous. It's a decision the game forces the player to make, but far from being seen as abhorrent the game treats it as practically the best outcome ("the perfect ending", according to the November beta .tlk files).
Nothing justifies decisions about a person's body being made without their explicit consent or at the very least consensual representative power (and even then it's murky), power that nobody invests in Shepard beyond hoping s/he'll defeat the Reapers. Attempting galactic peace on the advice of a celestial magic space-god that alters life without its consent is just so wrong.