Played a bit of this tonight... so far, I like it and think it may have the potential to be the best of the expansions. Keep in mind I haven't done much, just explored a bit of the area.
Let's see, so far:
-There are a bunch of locations for you to discover, and the world map feels larger and more freeform than the other expansions, almost like a mini Wasteland
-The beachside town/swamp setting is pretty cool
-There seems to be a bit more background story in this one, and already I feel there is some mystery. Hopefully this doesn't end like the Pitt, which had a rather disappointing finale
-Quite a few new enemies to fight, kind of like super mutants crossed with rednecks
-A quick glance at the wiki shows quite a few mini-quests in addition to the main 3