I guess I was never in the mood for this series, but ... it all fell flat on me. Not only consisted every episode of showing Inhaho´s superior mind by showcasing the incompetency of all others. I had no emotion at all over their death in this last episode (quite ironic, eh, Inaho?! lol).
The writing of this anime just feels so incompetent, so rushed, so ... "wanna-be". Like it´s trying to emulate other, more famous, more popular anime series that had a theme of desperation and cruelty. But where other anime manage to present properly developed characters with properly developed motives and behaviors, Aldnoah.Zero never even got close to that. Instead, it´s formualic almost to Pokémon-levels: Episode begins with some exposition -> action scene -> hopeful occurence -> suddenly desperation -> cliffhanger ending on either positive or negative note, accompanied by awesome Sawano-music. And in before, no, you could not describe every anime like that. It was painfully obvious in this case.
In the end, I guess your enjoyment depended on what you were expecting. From the bombast, time-taking beginning, I expected a much more intelligent, satisfactory story. What I got was a China-ripoff of Attack on Titan.