Eh...I didn't like it as much as D2. Not sure if they will change it up before release, but as a comparison I did the GR Breakpoint closed test and other than being smaller, having some bugs, and a few minor tweaks, it pretty much was the same. So I doubt the release of this will be fundamentally different.
I think this will be F2P, so no investment needed other than time, and I don't think I will have enough to spare to make it worthwhile. I played the main missions in D2 but had no interest in the end-game grind.
So far, F76 is the only game of that type that I've played a lot of after finishing the missions. Of course, they're not done releasing new stuff for it yet, so there's more to come there.