As I recall, the producers were saying that this whole story wasn't going to be about humans vs aliens, but rather humans caught in the middle of aliens vs aliens vs aliens from before the series began.
Not sure why the board is giving this show so much flak though.
is pop sci-fi for the masses (with decent ratings to reflect that as well)
Enjoy it for what it is, don't get bogged down in hating it for what it isn't. lol