I finally had the chance to play through both Far Harbor and Nuka World. Both were good, with new world spaces to explore, new people to meet (and kill), new monsters, quests, etc...
Of the two I liked Nuka World much better. This is in spite of it being mainly geared toward your character taking over a group of raider gangs. You can go the non-raider route, and simply kill them all (which is what I did since I was playing Persephone). That cut the Nuka World main quest short, as it ends with the last of the raiders being wiped out.
But there was still a huge amount of world to explore. The park itself is divided into 6 zones. The raiders are only in the first one. If you play as a raider you are clearing the zones and assigning each to a gang. As a raider-slayer you are just clearing them like any other place. But there is still lots of fun stuff to find and side quests that you can do. Plus there is more Fallout history to learn, like how those Nuka grenades from Fallout 3 were first created.
Being a theme park, the whole place has an exotic, strange feel, even for a Fallout game. One of my favorite places was a Space Mountain type ride filled with killer robots. The bottling plant (The World of Refreshment) was a lot of fun too. Nukalurks!
There is a small wilderness area surrounding the park. But it is mostly sparse. Still there are places to discover, and quests to do. The most interesting of the latter is similar to Come Fly With Me from New Vegas. But has a very different ending!
Far Harbor was a good dlc as well. But the ever-present fog annoyed me after a while. Especially since it is radioactive, which means you are constantly popping Rad-X and RadAway. The fog also causes definite lag, even with my Titan X video card.
The main quest is interesting, but I did not like the narrow list of possibilities. You basically have to either wipe out the Children of Atom on the island or the town of Far Harbor. Or just abandon the main quest. Though you might be able to kidnap the leader Atoms and replace them with a synth. TBH, when Hecate went in to infiltrate them, the first thing she saw of the Atom's behavior set her killing switch on. So she did what she does best on all of them (and it is not very pretty). But even when it was all over, the game did not recognize that she had wiped them all out, and she had to nuke their base (granted, it's the only way to be sure...

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When Hecate finally returned to the Commonwealth she was glad to be back. That might just be because I was getting tired of playing her after the last few months. But it was also at least in part because of the dreary, cpu-killing fog over everything as well.
This post has been edited by SubRosa: Jul 22 2017, 02:33 AM