Gabe, remember that the ending was rushed by Bioware's own admission due to the original script being leaked. In the original, the Reapers DID have a "collective consciousness" reasoning behind their harvesting; that's why they take the most advanced civilisations and make Reapers out of them. They were trying to create Reapers intelligent and capable enough of fixing the dark matter crisis that was originally going to be the main 'bad guy'.
But I disagree that the Reapers should have had their origins explained at all - I think explaining their motives a little is acceptable, but not necessarary. I think leaving the Reapers still partially shrouded in mystery is necessary for them to remain interesting; like Sovereign says, they simply ARE and they don't feel the need to explain or introduce themselves to you. This is really basic storytelling - the answer will never ben as interesting as the question.
But I disagree that the Reapers should have had their origins explained at all - I think explaining their motives a little is acceptable, but not necessarary. I think leaving the Reapers still partially shrouded in mystery is necessary for them to remain interesting; like Sovereign says, they simply ARE and they don't feel the need to explain or introduce themselves to you. This is really basic storytelling - the answer will never ben as interesting as the question.