I stopped watching at ep 17, but the fun was already gone at ep 11 or 12.
The first the Episodes were good times though. I'd buy the first couple of Dvd's.
What impressed me :
This Anime was very straight. How they get to the surface, sart fighting reckless. and get an army ready. I just slippered through the Episodes wanting more.
[spoiler]And a sudden death gives you the feeling : OMgwut? Needs to know how the Anime still can go on[/spoiler]
But then we come to a point where just one enemy after another comes, they get a little beaten up and then comes the super fighting spirit --> win. That's just lame
Character Design is like "Waaah?? Great !!" too. And its dammed weird at the beginning.
I thought these ugly looking robots where just for fun