Vaenier wrote...
Bio Sil wrote...
Vaenier wrote...
The-Person wrote...
If that was so, why did vigil say it too hundred of years to take care of the Protheans?
Killing a planet is super easy, finding all the planets with people on them is hard. there are between 200 and 400 BILLION stars, each have any number of planets. do the math. technically, it should be impossible.
Maybe the Reapers are just a chilled out bunch who like to take their time.
Whats the rush? the galaxy's population aint going anywhere 
On a more serious note, I have a question which i'm probably gonna get torn a new one for asking but; Why does the Reaper inside the collector base look like a human when all the others look like weird beatle things?
I know its created by harvesting humans but did I miss something else, why don't the others look different to one another?
It made a "cooler looking" boss.
It was implied by fans that it would later form a shell around it, but the derelect reaper proved that wrong after you visit its core and do not find a giant alien in it.
Here is a snippet of the dialogue that preceeds the final battle in ME2.
EDI: It appears the Collectors have processed tens of thousands of humans. Significantly more will be required to complete the Reaper.
SHEPARD: What did the Collectors gain by turning humans into this Reaper shell?
EDI: They may be facilitating the Reaper equivalent of reproduction. Or it may serve another purpose. I do not have the data to speculate further. However, it is clear that the Collectors are merely pawns. The technology and ability needed to create this Reaper is not their own. It is likely that diferent species construct each Reaper. In this case, the Collectors provide the labor.
SHEPARD: The Collectors are just Protheans. Why would they help the Reapers?
EDI: The Reapers subdued the Protheans long ago. Probability suggests they attempted to create a Prothean Reaper, and failed. Over time, they adapted the Protheans to suit their needs--changed them, turned them into workers, tools for the Reapers.
SHEPARD: They're building it to look like a human. Why?
EDI: It appears that a Reaper's shape is based upon the species used to create it.
SHEPARD: Reapers are machines--why do they need humans at all?
EDI: Incorrect. Reapers are sapient constructs, a hybrid of organic and inorganic material. The exact construction methods are unclear, but it seems probable that the Reapers absorb the essence of a species, utilizing it in their reproduction process.
SHEPARD: How many more humans do you think they'd try to take?
EDI: Millions. Perhaps more. Impossible to know for certain. This Reaper appears to be at a very early stage of developement--an embryo in human terms.
If EDI's guesswork is at all accurate, the answer to your question about why the Reapers don't look different from one another is that Bioware got lazy in making the ME2 closing shot and the shots of the Reapers from the ME3 trailer. They SHOULD all look different. There should only be a handful that share Sovereign's form, with many others being as diverse from each other as an elcor is from a batarian. If it takes hundreds of thousands to millions of lives to make just one Reaper, it would seem that only a few new Reapers can be created every 50,000 years. That would also explain why it takes such a long time for the Reapers to achieve their goals each time--they are NOT wiping out the galaxy's organic life, they are HARVESTING it. What we see the Collectors doing all through ME2 is not a departure at all from the Reaper's normal modus operandi.