A great addition to Deus Ex: Human Revolution, more global conspiracy drama, and more emphasis on stealth action.
The gameplay is very familiar to those who have already played Deus Ex: Human Revolution. The gameplay places greater emphasis on stealth as the cover system becomes very important. There are still various choices you can make in how to approach a given situation. One clever move to bypass a laser grid is to crawl behind a moving sentry and as the sentry passes through the laser grid, you can bypass the laser grid as it momentarily disappears when the sentry passes through it. There isn't as much replayability as Deus Ex: Human Revolution but the game is still plenty of fun to play.
Later in the game you will find out that you are not the only prisoner on the ship. There are many other prisoners who are treated like lab rats. Among the choices to be made throughout the game is a moral dilemma that occurs late in the game: save a doctor who can provide incriminating evidence to Interpol from gas poisoning or save the prisoners from gas poisoning. It would be possible to save both but you will need specific augmentations. In essence, this DLC still sticks to what makes the Deus Ex franchise special, which is the ability to make choices and choices have consequences.
I would recommend this DLC only after playing and completing the story in Deus Ex: Human Revolution. Completing the base game would give you a better understanding of the plot in the DLC. Some people may not like this game as much as the base game due to the short story, few side quests, and lower replay value, but it's still worth playing.