The irony is that when you finally meet NPCs that logically should survive your shots, they die just as easily as everyone else.
Playing solo, my problems would be:
- the dark zone is too dangerous, not due to players, instead it's the roving groups of purple NPCs that walk up behind you.
- the storyline is... well there isn't one

.
- the storyline progression is messed up. As someone mentioned LMB appears without any introduction, and everyone seems to think that I know who they are. Similarly, they introduce rogue agent evidence in the early zones, but characters are shocked to find evidence of rogue agents later
.
- the stats are a bit too abstract, and everything suffers from being kindof unexciting (most perks/talents are literally +3% something-or-other). There's no sense of 'rolling a new character to see what X does' - it does +3%.
- the guns are statistically different, but most feel pretty damn similar.
- there are 4 or 5? different enemy 'races'. So the game very much suffers from the RPG "level 30 rats" syndrome, where the same mob is repeated over-and-over again at different levels.
- building the base seems cool, until you realise that all of the 'upgrades' are just basically visual.
I'd give it an 8/10. The engine/setting is spectacular, the game less so.