If you liked the first season than this is "mostly" more of the same. It resolves the cliff hanger at the very end of the first season, contains a mostly complete story arc of itself, but leaves you open to the possibility of more going forward. It's tone is "slightly" different than the first season in that it's more of a "maturing as themselves" tone than the first seasons "meet the crew" hijinks. You can see development and growth. The personal interactions are mostly similar though with a few characters having their backstories more fleshed out again. Over-all I enjoyed it, though it feltlike it had slightly lost some of the originality and charm of the first season, though not enough to make you go "it's not good anymore" or something similar. The voicing was good, the art of the same quality, and the score at an acceptable level. A few moments when the pacing might have been a touch off, but that may also just be a personal thing.

In general I'd say if you enjoyed the first season, the 2nd is worth a watch.