This is easily one of the best DLCs I have played in a long while. Ignoring the obvious fixes that the update accompanying this made, such as the skill trees not being a bunch of fucking dart boards anymore, it feels like a more compact and clearer version of the game. For example, the added map has a lot more happening in it, and side missions feel more fulfilling.
Most importantly, the main campaign is more varied, doesn't waste your time anywhere as much, and has a lot of twists and turns that make it feel a lot like modern Bonds film (with a Casino Royale reference to boot!)
It makes me wish the rest of the game was more like this.