Dr Snakeman said:
See, I actually had problems with this as well. The way I see it, they are just going after Earth first. The Reapers are planning on harvesting the human species to make the next Reaper, right? So, before they go and begin their unstoppable genocide of every species, they are going to grab all the humans they can. I figure that the plot of the third game is going o be something like, "Okay, the Reapers have landed on Earth to collect humans for their next Eldritch Abomination. This is the only time they are vulnerable, so we need to come up with a plan to destroy them before they get the chance to attack the rest of the galaxy."
It's safe to say that I spend way too much time thinking about Mass Effect.
I would say not necessarily. I'm going to assume you played ME2 (since it sounds like you did) so you should remember what the Collectors actually were. Humans (specifically shepard) laid some serious smack down and killed most of them (this is mostly assumption based on what we know from ME2, there could do tons more collectors out there). So I think it's a couple different things:
-They could take many of the Humans and create another reaper (Or 2, or 3) to help them destroy everything else.
-They could take a large handful of the more "perfect" specimens and turn them into Collectors 2.0 to use as their eyes and ears when they retreat back and let the cycle continue of evolution of new species and eventual destruction by them (the reapers) again.
-Humans are, if I remember correctly, one of the most numerous citadel species out there, and they are expanding far faster then the other races that have been around for longer. By taking out what, effectively, should represent Humanities ultimate defence and final place of safety they could strike a major mental blow against the rest of the humans in the universe to perhaps prevent them from fighting back as hard.
-(I personally don't think this but a buddy of mine suggested it) It could simply be revenge on Shepard. Sort of like, "You ruined our citadel plans, you destroyed our attempt to create a new reaper from humans, now we are going to fuck up your home planet to make things square." (I can't see a hyper advanced AI race stooping to revenge as a reason for doing something which is why I don't agree with that scenario)
Plus for all we know this is just like, the initial wave the reapers have sent out while the rest of their forces are moving into position to strike elsewhere. I mean, it makes sense strategically to me. Get an entire race and several of their allies to focus on one front (the Earth front in this case) and then while they are busy with that send a secondary force to the other homeworlds/major planets and obliterate them while they aren't as strong as they could be. It's aided by the fact that we don't know how many Reapers are actually out there as well.
From the trailer it looked like there was maybe 7 or so reapers attacking london, so it's probably safe to say that (assuming they aren't just attacking london) there could be several hundred reapers just attack Earth cities. Personally, 100-200 Reapers a Reaper Army does not make, I'd assume their would be millions (if not billions) of them if they are able to wipe out all sophisticated life in the galaxy. Otherwise it would just take forever for a couple hundred reapers to hunt down and extinguish every little pocket of resistance that pops up somewhere.
I dunno, just how I kinda look at it all.