User blog comment:Simi truck/spoiler warning! final boss on me2/@comment-24.125.215.8-20100211152357

The geth was created by the quarians as servants until becoming self aware once their programming evolved enough. The reapers and the protheans are much older than the quarians are as a species. The geth you fight in ME1 are basically extremists that have splintered from standard geth. The reapers themselves are of unknown origin. They are both machine and organic suggesting that they were never some sort of simple AI that became aware.

On topic, it's somewhat feasible for the reaper to look like a human considering its using human genetic material to creat a new ship. It's a huge stretch on the story though. Considering it could take up to millions of people just to make one ship, it seems odd to have a reaper fleet that is similar in appearance.