I dislike most alien invasion stories. With few exceptions* they involve alien armies which attack Earth for completely illogical reasons, use tactics and weapons ridiculously below their technology level, and get defeated through combination of humans' ingenuity and their own incompetence. "Posleen" series is almost a parody of the above. John Ringo actually mentioned in some interview that he dislikes the genre I described for exactly same reasons I do, so... he proceeded to write a series which takes the same premise to an absurd extreme. Why does anyone like that tripe? (Other than the fact Posleen books are endless carnography, and I am aware there is a market for THAT.)
*I like Kzinti stories because Niven and his shared-universe collaborators carefully designed a social structure for Kzinti which is internally consistent, makes outward expansion inevitable, and limits the destructivness of said expansion. But this is an exception.