Just finished Nuka World. All in all, I thoroughly enjoyed it.
Sure, it's not as big as Far Harbor and the main quest choices are lacking, but the park itself is awesome. I enjoyed the locale and exploration more than I did in Far Harbor which, after a while of walking in mist, was boring. Also, ride-able roller coasters.
However, I agree that the choice you have to make in the middle of the raiders quest between them or the settlements (and Preston), is kinda silly.
That's why I modded my game to allow to skip that part of the main quest and continue without attacking the settlements (basically, it auto-finishes Home Sweet Home, it's up on the nexus). I continued with the rest of their questline and then started Open Season to clear the park.
Park is beautiful when you restore the power. Shame that you can't use it as a settlement.
Also love the dialog here, when asked why did I cross them in the end.