Plunderer is a hard manga to review, but as most of the reviews are outdated, i figured i would give it a shot.
The story starts off decently enough, but does not really start spinning its gears untill a volume or two in. Once it does though, you are in for one hell of a wild ride.
As aforementioned, it is extremely hard to review because damn near everything good about it counts under the category of a plot twist. I have never read a story with as many fucking plot twists jammed into it as this one, you cannot go two chapters without the status quo getting ballista bombed into the sun. It is virtually impossible to predict what will happen next as the story continues to unfold in the most unexpected and exciting ways.
That being said, its such a rushdown of story that the pacing is a tad off, i would even go as far as to say it is too quick, and the "lets take a breather" comic relief chapters suffer from even worse whiplash then usual despite it being a norm for manga. Luckily, the characters are so strong and the plot is well tied in with the charactes themselves, that it is never too much.
As far as the art goes, there is not much to say about it. It is a very clean and very expressive style that is perfect for action, it looks perfect, although somewhat generic.
In short, this is a fun action story that will subvert your expectations roughly every other chapter.