http://www.joystiq.com/2011/10/14/deus-ex-human-revolution-the-missing-link-review/
That is pretty freaking long for a DLC.Going through Deus Ex's growth arc at super speed (well, it's still five to six hours long) makes your choices feel more important and immediate, even if it's done without the thrust of a huge campaign. And the payoff is worth it. This time, you're able to tackle the boss exactly how you want, even if by "tackle" you mean "stab to death with sword arms."