Reorte wrote...
Just saying "That's stupid" does exactly what you say but it seems to get the same reaction if you say "That's stupid because..." Without that expression of value a criticism can simply be replied to with "So?"
Yes, that's a valid point, but then again, I would not claim that the responsibility to make meaningful arguments is confined to the "contra" side: If you voice a criticism that is dismissed with a "So what?", that dismissal is just as pointless within the scope of the discussion as if you had formulated your criticism as "it's stupid" – The road goes both ways: Both sides of the discussion need to play along, so I'd call out the "So what?" person instead on not making any point themselves, rather than provoking/attacking them on an emotional level.
Reorte wrote...
"There's no plausible mechanism for Synthesis" for example. Now try to explain just how absurd it is without sounding insulting to the idea.
The question how Synthesis works technically is super-interesting, actually, since there are so many levels you could discuss this on, without needing to resort to "it's stupid": As an example, there's the whole idea of nano-machines that get broadcast – through the beam? or is the beam an intangible sort of energy that can spontaneously assemble nano-machines from inter-stellar dust particles, akin to the "grey goo" idea? etc... And then there's a wholly different level, namely that of dramatic effect: Let's not dismiss that the colored explosions spreading across the galaxy also serve as a dramatic way to visualize the propagation of the change - just showing a still of the galaxy with subtitles "not synthesized, but (click) now it is" wouldn't work in this medium, so the style of presentation needs to be factored in as well. Then let's not forget that Reaper tech is supposed to be extremely advanced, so even nano-machines might be way too trivial, way beneath them, and that could be a departure point for the most keen speculations that can arise collaboratively through a fan discussion... Remember the infamous "Tali's sweat" thread? I wonder if – given a more open climate for discussion – people wouldn't do stuff like calculate how much mass/energy the Crucible must contain in order to synthesize a sufficient amount of nano-machines for that theory to work, as an example... And the nano-bots are just one idea I've read on these boards (and, incidentally, it's also the explanation I had in mind when I first saw this ending, but maybe that's because I read the ME books, in which Paul Grayson's indoctrination process greatly addresses the Reapers' capabilities to harness nano tech).
Then again, a different level of discussion would be the ways in which the missing scientific explanation of "Synthesis" affects the narrative: I guess some might argue that it not being explained also adds to the mystery, the God-like state of the Reapers, whereas addressing how things getting all too advanced, too "magical" can make the recipient feel disconnected from a game universe they thought to understand...
Anyway, I'm getting lost a bit, but the point is that something is going on in your head that brings you to a point where you are convinced that Synthesis is entirely absurd, but the interesting contribution to the discussion is that what is going on in your head. It's like with mathematical theorems, where it's not really interesting to simply write "holds" or "doesn't hold" under it, the whole thought process going in there (the mathematical proof) is the interesting part. If you write that down and then close it with "And for this reason, I believe it to be absurd", it's perfectly fine by my standards at least, as long as you are open to others picking up on your line of thought and maybe showing possible errors, invalid steps, missing information, unwarranted (e.g. not lore-conformant) constraints, etc...
Or, put differently, if in doubt, write down your whole thought process, not just the final conclusion, and be ok with people discussing it from there. Many of the best threads here have been made by people who disliked something about the game, but wrote very witty and thoughtful OPs, from which the discussion could sprout along both ways of the argument.