Not particular happy with the ending, but I'm also not particularly upset about it.

- Q-vier died, but not as horribly as I had hoped.
- Pino didn't lose her brother in yet another tragedy ending for the being that made this all possible.
- Haruto died and Shoko has to live with how the two of them ended things...forever!
- Kriemhild's dress at the wedding...
- Apparently a lot of alien species pop in to attack the solar system?

I certainly hope Takahi is immortal as well as Renboukouji, that would be kind of a bad ending, seeing them getting married and then knowing only he was immortal later.

The flashforward I'm still really curious about is the one where Rukino is fighting around Jupiter or Saturn or whichever it was in the first season, and it was several years after the happy ending flashforwards. The dialogue from the sequence implied things weren't going too well for their empire.