Mouretsu Pirates is effectively a slice of life show jammed into a space opera. Because of this, it feels in many places that the series is not entire sure in which direction it wants to go. This is amplified by the fact that the series takes the plots from several of the light novels without trying to tie them together. The result is a series of unrelated story arcs that begin out of nowhere.
Mind you, the story arcs themselves range from incomprehensible to interesting. In some cases, the conflict is resolved without fully explaining how the conclusion actually ties up the loose ends. In other cases, though, everything is brought to a close while still making sense. The good stories keep my score in this category up, but the disjointedness of the series as a whole winds up removing quite a few points.
As mentioned above, it's an okay show. It is most definitely not some piece of generic schlock that you usually see littering the anime world. It instead has a great space opera setting with a fun story concept. Unfortunately, Mouretsu Pirates is lacking in execution.
in other words plot sucks, and not interesting cases solve by themselves. i would just skip it.