After reading a few reviews I thought "heck people seem to like this and it has a sequel running, could be interesting right?". Well right of the bat in the first episode I had a more or less "wtf" moment and it wasn't a good one. We go from cliche school setting to super powerful next to impossible to kill boss fight in a instance. Oh in classic mecha style all defenses are useless and we have a professional scrub force that gets instawhiped, like why even bother. Out goes our hero, badabing badaboom boss fight is over.
The good stuff about the show
is sound and art, sound in particular is great.
The bad stuff: well the story is non-existent the first six episodes, characters are just background material as we don't get to know a thing about them. While it wasn't a Suzaku Kururugi (code geass, I was baffled that he didn't die like 500 times in that shows first ten episodes) for me but the "main" duo are presented so badly and story forced into stupidity that I just lost interest. A cake covered in poop is still a poop cake no matter how nice the filling is and this show something like that.
That turned into a ramble.
In short: great music, colourful and for the most part good art, really badly presented story, character presentation is borderline criminally bad and finally lots and lots and lots of stupid cliches.
If you are looking for action fiesta there are better options and if you are looking for a good story there are better options too. Your mileage may vary but to me its a no go.