This weekend, I play the Fallout New Vegas DLC, Honest Hearts. So I though I could give you some of my impression on it, don't worry, It will be quick. First of all, the tribe was an interesting idea but they doesn't seem to do much, you have to work for Daniel or Joshua Graham, the Mormons. Without spoiling it, I would have love a third or fourth option there. No much new thing too, only a few giant monster and the weapon are not this diversify, I used the 45auto for most of the time because their ammo are so abundant.
The gun he's holding
Final thought : Wait a little, maybe it would get in a bundle DLC pack for a cheaper price, for the moment Honest Hearts is short, you only have like one gray moral choice to make and the add content isn't that interesting.