This review is partly for both seasons. As i found this season much more satisfying then the first and ill get to that later. Gravion is your typical old school mecha show with plenty of fan service to suit your needs of that desire to look at naked girls or "maids" as they are in the show. If your a fan of echii, then you will see alot of it, even more so in the 2nd season. The formula of the series as a whole, is pretty generic, robots fighting some form of unknown alien existence that threatens mankind. They are known as the zeravire. Theteam of the G pilots that pilot the mecha called the "gravion" is the team that is under the command of a billionaire named Sandman who leads this team of fighters to victory against the onslaught of the Zeravire.

The first season is at most pretty predictable throughout the show, just alot of action against the zeravire. Plenty of comedy bits with the maids and over the top action. There is a bit of a story that is central to the series though that is very subtle in the first season. But if you can manage to muster the first season, you will be treated to a much more satisfying plot in the 2nd season. The characterization is definitely stronger as you get to see the characters develop in different ways and you get to see there different personalities. There are some very dark deep secrets that are only unveiled in this 2nd season that i do say so my self really caught me off guard. So if your a fan of mecha or echhi, i say give this show a shot. It definitely probably wont live up to "power house shows" like Code geass, and the Gundam Franchise. But after watching it my self i did actually enjoy it to the extent of wanting to watch every episode of this season with out stopping, there was some pretty surprising story developments and that is what i like in this anime.