I personally enjoyed the storyline of this sequel. It is made up of three distinct sections, which are all very good, but all very different. This is both the making and breaking of the storyline. It means that if any of the part are less agreeable with your personal preference you can take heart in the fact that it won't last long. However if you like one of the parts it doesn't last long either.
Very good. Very like the first series. Excellent character design and backgrounds. Action sequences are slightly improved from the forst series.
The soundtrack is very good. This will go unnoticed though as the voicing in this second series is horrendous. The attempt to play the protaganist as a translator is admirable, but the voice actors got their jobs for their japanese voices not their attempt at english. This does ruin the Sound of the anime.
Excellent development. I particularly enjoyed how Rock's unshakeable, black and white view of the world is starting to be questioned and become a little grayer.
Excellent follow on. If you watched the first series and liked it, this is excellent and should be watched.