I'm one of those people who left a disappointing review at launch and I've not played in a few weeks but have been following the patch notes.
Is it better? Definitely. Is it where I want it to be? Not quite.
The map is still pretty empty, which was fine in the original but in this with a 4x bigger map it doesn't work. They've added a few more things but it's still not enough, imo the map should've been smaller.
The caves are also still disappointing, some of the ones they added post launch were an improvement but there's still a lack of alternate paths and no interconnectivity with other caves.
The building has gotten significantly better since launch with more prefabs and improvements to the free building.
But my biggest issue is still present which is the story and especially the ending. I won't spoil it but it was just a bit anticlimactic for me and the "reveal" at the end just seemed like a shock factor and has no impact after revisiting. I know some improvements have been made like more things to find around the map and some video footage but I've not played since those were added.
For the most part I'd say it's worth it, but if you want it to be really really good, I'd probably wait a little longer