User blog comment:HELO/Le-WHY-athan/@comment-4950455-20120908055305/@comment-4950455-20120908062324

If anything, the Reapers are technologically ahead of the Leviathans, not the other way around - we know that they've refined indoctrination from the original mind-control ability, and they were the ones who built the Citadel and mass relays (though it's possible the Leviathans had the capability, just not the inclination).

The Leviathans were certainly more advanced to start with, but as far as I can see they haven't advanced meaningfully in the last billion years, just sat around in the ocean and watched. The Reapers have advanced, though we don't know by how much).

Again, I certainly agree they're a threat, to the Reapers and everyone else - I just think that the extent of that threat has been exaggerated by the community here.