What's good about this show is the action, artwork, and sound/music. So at the very least, the show is aesthetically pleasing.
The problem with this show is pretty much everything else. The plot, whatever it was, was pretty difficult to follow. Maybe it was a combination of this show being hard to take seriously during random hilarity (like the HIGH TENSION taxi chase done CHINA STYLE) that ensued during the first few episodes, or maybe it was due to people making a lot of metaphoric statements that really don't relate to the viewer very well until the last three episodes. The intentions of the protagonist/antagonist forces are pretty vaguely explained late within the show, and whatever reason Alphard was doing stuff to make Canaan's life miserable, the more I think about it, the less sense it makes. And generally, the characters show very little development. The same behavior like Maria constantly idolizing Canaan or YunYun being a noisy flat-chested klutz gets pretty stale.
At any rate though, the plot really doesn't have particularly huge depth, despite being as confusing as it was. There weren't any real plot twists for the most part, nothing that really would blow your mind away as x character did something ridiculously huge that changed the direction the story was headed. Nothing like that ever happened. So really, the plot is ultimately nothing outstanding for all the trouble it goes through to pretend that there is a huge awesome story behind it.
If there is one anime where I would tell you to watch a few specific episodes and ditch the rest of the show, this would be one of such. The first three or so episodes have some of the most epicly random action you will ever find in anime. Although I guess 13 episodes isn't a huge waste of time, watching the last ten episodes I believe is ultimately a disappointment waiting to happen.
