Ishiken wrote...
I never understand why we couldn't defeat just some Reapers with the Crucible but not destroy every single one of them. If the united galaxy fleets take out several Sovereign class Reapers, wouldn't it fit the story that the Reaper would retreat into dark space. The galaxy would be saved however the Reaper threat would still exist so that the Mass Effect universe can still progress, and the next game could be the galaxy taking the offensive against the reapers by going into Dark Space or trying to discover more about the Reapers so that they can completely defeat them in the next invasion. The Crucible wouldn't become just a Deux machine anymore.
You're falling into a horrible plot hole, a sin committed by most Hollywood alien invasion movies with that logic.
Human perspective upon victory:"An alien race comes to Earth, destroys most of its military, all of its organization, economy, and severly disrupts vital infastructure, but is eventually over come by <insert action star here>. Humans beat the aliens, and everyone is happy."
Except by the point, during that happy ending, your planet is teetering on the abyss, weak, vulnureable, and completely uncoordinated. Why an alien race that is not -completely- migratory with all eggs in one basket doesn't simply send another wave, even some sort of auxillary and finish the job, is beyond me.
Defeated alien perspective "Oh, they stopped our main invasion force with a computer virus? WTF? We'll just install Martian Kaspersky and go pwn them. Oh, Earth has these things called viruses that can kill us? OMG, water hurts US? (even though 70% of the Earth is water and you'd think they'd have figured that out, Signs). Yeah, we'll just all wear environmental suits next time instead of running around naked. Earth destroyed."
The Reapers wouldn't be vulnurable at the end state of a victorious Battle for Earth. The allied races would be -immensely- vulnerable. What would stop them from simply mopping up the remainder with the Thessia or Palaven forces?