Just finished the Pitt. MUCH better then the last DLC. I am one who actually enjoyed Operation Anchorage, but ultimately it was more of an amusing 2 hours then an actual Fallout quest. The Pitt, if you actually try to get all the achievements, for me at least was a solid 5 hours. The whole quest was amazing looking, the story was interesting, there was multiple ways to finish it, and lots of killing. If it was part of the original game, it would have been one of the high points. Easily worth 10 bucks.
SHORT? The last DLC took me maybe 2 hours? This took me at least 5 hours, esp. to get all 100 ingots.