The first episode of the show pretty much tells you exactly how the entire thing is going to pan out.
It foreshadows, highlights the theme, and contains the animation and style that you're going to find throughout the rest of the episodes.
If you actually /want/ to enjoy it, then you probably will, as long as the characters don't piss you off. If you hate the characters, you'll hate the show. (That holds true for any show).
I can't answer all of your questions, but I can tell you what it is, at least: It's a show that pays tribute to all the great super robot shows of the past, while blazing a trail forward. It's high intensity action with a theme and message that's delivered through metaphor in the actual plot. Think FLCL with a story.
Sorry for the shit post. It's hard to collect my thoughts in such a short time.