Yeah I'm fairly deep into it and it's pretty entertaining. More so than Far Harbor was simply because there's more variety to the locations, though the main plot is abit weaker. Only downside is there isn't any really good gear. The armor for the raider groups is pretty shitty and the new guns aren't very interesting as the main one you find is just an AK47. I'm most of the way through it though. I've cleared all the Nuka World areas and now just doing some of the raider leader missions. Trying to figure out where the plot might go.
*EDIT*
And done with the pretty much all the quest stuff. Overall, the scenario and setting is cooler than Far Harbor, but it feels lacking story wise. The story was pretty one note, which is probably the only thing that Far Harbor does better. In that you had the story about whether you wanted to side with peaceful Synths, the crazy Atom folk, or the Far Harbor people being pushed off the Island. You also had the stuff involving Nick and whats his name. In this, there's really only one choice of helping out Raider. You can kill the Raider leaders right away for the traders they enslaved, but then you don't get any missions to take from the Raiders, so would make things more boring.
There's also nothing really interesting gear wise. There's a couple of differently painted Power Armors, and some weapons that mostly just feel like variants. Nothing truly cool, or at least looked cool, but aren't super useful combat wise. If I had to rank the two big DLC packs, Far Harbor would be like a 6, and Nuka World might push slightly above at an 7, but abit bummed this is the last of the DLC we'll get. Guess just gotta wait for someone to make some new crazy mod expansion...