I tend to agree; the story in the Osiris expansion so far is dreadful, though the environment on Mercury (the Infinite Forest) is pretty cool.
The real bad thing for me is bugs. It crashed once, and then it stuck me in an area between two unopenable force fields, telling me I had to kill some dude, but some dude was…on the other side of the unopenable force field in the area I had just come from. In other words, I apparently spawned this dude, and then moved into the next area, and then the game locked me out of the place I was supposed to be. I tried suiciding but that just put me in the same spot, so I had to abandon the whole fucking quest, and now have to do it…all…again. Ugh.
OTOH, Some of the new gear looks pretty neat.