So I'm watching this new Sci Fi channel series called Defiance.
They want us to believe that in less than 30 years, seven new alien races have set down roots after a huge invasion that went sour. In this short span of time, A rockies size mountain sprung up around St. Louis, which I gather, will be the central stomping grounds for all these races.
To make it really plausible, as far as anything on SciFy can be plausible, they should have set it about 200 years in the future.
Anyway, it's just a frontier town populated with a bunch of alien races that magically came to earth, decimated the globe and then set up jumbled settlements in burned out cities.
Oh and I forgot to mention all the new kinds of animals that were suppose to pop up in 30-35 years out of god know were.
Sloppy.
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they want you to watch the show to find out. 
I think the other alien species already knew one another, though (seems to me they must have arrived together, for whatever reason - maybe their solar system was dying or something), so it was just a matter of destroying our infrastructure, along the rest of the planet as we know it, and then taking over. That's what the conquering force usually does in any case, right? They take over. Obviously there are pockets of resistance, hence "Defiance," but they seem to have conquered Earth with superior tech, and that was probably pretty easy for them. Except for the defiant ones, of course. But hey, like I said, those are the kind of questions, the how, the why, etc. that the showrunners hope will make people come back next week, and the week after that, and the week after that... to find out the answers.
Is it plausible? Probably not. But it doesn't have to be. It just has to make viewers want to know the answers to those questions. It has to make them care what happens to the characters, and hope for them to win. It may or may not succeed as a show, but it has a huge fan-base already through the video game tie-in that already started weeks ago. It's kind of an ingenious idea, because what happens in the show affects the game, and the game can also affect the direction of the show. Gamers out there are loving it, from what I hear, and that's their target audience.
Your assessment of it, just made it official for me, NOT going to bother with it. 
