I've just spent a good number of hours with my initial run (slightly modded), and basically I'd say if you enjoyed the previous Fallout games (I never got them), or at least Skyrim (which I'm still enjoying), then I would think it would be worth buying - there are bond to be some patches shortly, and there's going to be a ton of mods.
One thing for sure - it ain't a Far Cry or Dying Light game when it comes to determining how to "play" the game.
What I find interesting in the structure of this game however is in the post-nuclear war of the 24rd century, apparently no bows, nor binoculars, survived or can be made ...
It definitely is worth the money, it has its problems, especially with graphic glitches, but it is stable and does not crash. The sheer immensity of "everything" will give you hundreds of hours of playing time.
I've… seen things you people wouldn't believe… Attack ships on fire off the shoulder of Orion. I watched c-beams glitter in the dark near the Tannhäuser Gate. All those… moments… will be lost in time, like tears… in… rain.