Mass Effect 3: From Ashes reviews

Unlike the other DLCs for the game, it doesn't give you hours of new areas and missions. What this does give you is a new squad member who is so key to the game and crew interactions that its clear he was originally in the base game.

Grumbles aside about how this was integrated, this DLC is a must have when playing Mass Effect 3. Javik adds a lot of interesting view points to the lore.