Overall:
Excellent world-building and plot. The first episode's ballot system is a promise for the next 21 episodes that does not disappoint. I won't spoil any of this except to say that IF you like plot then this show is a must. I almost dropped the show during the "girl learns to fly" episode and I'm very glad I did not drop the show.
Very bad ecchi. I love tits and titillation but this show does a poor job at working sexuality into the plot. Let me give an example: the awkward and fun moments in a show like Bakemonogatari are replaced, here, with a relentlessly pervy MC. Think the first episode of Dragonball repeated every episode. I'm a horny bastard, but this show made me numb to the panty shots. I was like, "please Plunderer, leave me alone and let me watch the story."
So I give it an 8/10 but if you can't stand the ecchi then its probably unwatchable.