Story: 6/10
The story is simple, a loose connection of shorts with the overarching theme of making a better city. It's not "great", but there is something there that kept my interest for the entire time I was watching. It left me wanting more, which is a shame as that's not likely to happen at all. For what's there, it'd get a above average, if not for the fact that the time of each episode didn't let the plot points flourish well enough to be satisfying.
Art: 8/10
Graphically, the show is gorgeous. The lines are crisp, the character designs are unique yet with clear personality in with what they wear, and even down to the mech suits. That being said, however, the 3D elements for the most part are somewhat jarring, in the same way that watching Kemono Friends for the first time can be somewhat jarring at the start.
Unfortunately, they stay jarring when it's mixed with the more traditional style, due to the overall length of the series, and at the very end the fully 3d section looks, frankly, disappointing. A shame considering the ideas behind the show, however they're in line with other mid level 3d "walk through" of concept design work at that scale.
Sound: 7/10
The music is great, the end theme is enjoyable, but the sound effects and voice acting could use some more work. Each hit has the slightest amount of impact, and the few times that they had the right impact, it was too late to add anything as the fight was already over. Not only that, but the characters don't add enough emotion into the script, leaving it more as a thing that's there. That said, they all mesh together well, there wasn't a moment I had trouble hearing a character talk, and when the music is needed to, it turns itself up to 10.5.
Character: 6/10
The Characterisation is, unfortunately, bog standard. There is the slightest hint of depth to each character, and the plot about why the bad guy is like they are bumps it up that ever so slight bit. They're not bad, just bland, and what they have that makes them unique isn't explored well enough to be notable.
Enjoyment: 7/10
Double Circle is good - for what's there at least. Whether intentional or not, it stays long enough to keep the fun from the action, and the small slices of life nice and fresh, however it's lack of time it could play with makes it leave something in your mouth that you can't quite nail down.
Effectiveness: 3/10
You won't normally find an effectiveness rating, however for a show that's trying to sell you on something, in this case an idea, it's something I like to have.
It doesn't sell what it is well. The overall idea seems to be a proposal to make Kawasaki into a smart, green city. The main plot has characters that are trying to take away from the beauty and effectiveness of the city, with the heroes having to stop them. They're not trying to stop the progress itself, just make what's already there dull and drab.
With no hint within the show itself about it being a proposal other than the very final credits showing a short 3d render of ideas for Kawasaki streets, to the fact that one of the main buildings in the show is a toshiba city block, it doesn't really find it's footing in selling you on the idea of a green city, and instead it feels "wrong".
Overall: 7/10
Double Circle isn't bad, and the overall length of it means it's a great little time waster if nothing else. It gives more of a taste of great ideas that will sadly not get picked up on any further, however that might be for the best. If you're bored, give it a shot, and if you don't enjoy it, at least it's not too long of a time spent on it.
