Captain Earth comes from the same dudes that made Star Driver, and it shows. The above description may have sounded like some kind of silly mecha comedy in the vein of Nadeisco or Vandread, but the writers play it completely straight. Just like Star Driver--which you'll recall was a show that managed to have its MC go by the title "Galactic Pretty Boy" and avoid ever acknowledging how absurd that is--Captain Earth is actually fairly grounded despite how frivolous it seems on the surface. Even though they have their fun times, these kids realize the gravity of the situation, and as of this writing Daichi has come quite close to being killed every time he's deployed in the Earth Engine.
Did you get all that?
Technically, this is a problem; Captain Earth is stuck way too far up its own butt. But to be honest, I don't really mind. Because at the end of the day, Captain Earth is still an enjoyable and entertaining show if you just roll with it. The cast shows a lot of potential; Hana is one of the more endearing characters of the season, Akari's constant attempts to steal the show are fun to watch, and Daichi can be surprisingly unpredictable at times, in a good way. The assembly sequence for the Earth Engine is super exciting, and the animators seem to know it, as it is present in in the opening and is always shown without fail when Daichi deploys. If you've seen Star Driver, this is nothing new; Tauburn's dazzling entrance should be etched into your mind.
Overall, this is a recommendable show. Its pacing is a bit slow at times--which hurts this series in particular because there are so many unknown terms and concepts thrown at you from the outset--but that allows for strong character moments. And with 26 episodes planned, they've got time to spare.