The DLC is essentially you having a shootout on a rainy boat and then getting in a mech and going underwater to talk to a Leviathan to explain a little backstory on the Reapers. Its an alright DLC that has some fun and tense moments, but it really doesn't add much to the story, and it really has no impact on the main game. Its really just a tiny chunk of back story that doesn't even add a whole lot to the lore. It is one of the better Mass Effect 3 DLCs but Citadel just puts this to complete shame.
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Having played this recently, it almost feels essential to the plot of the trilogy. Without it, the Reapers just remain a mysterious space harvester robots with no clear origin. Better than I expected it to be.