Reviewers and gamers appear to be disappointed with what they've played so far.
Main reasons: Repetitive/boring missions, lifeless, poor world-building, PvP is nothing special, loot is uninteresting.
I can understand the criticism about missions not being varied enough.
However, I've played the missions up until halfway-through Venus alone and with a mate. My thoughts: I had fun playing alone, but holy crap, it was much more intense with a second player. We were coordinating, screaming, laughing.
It was a blast.
And from what I've read here: Many people had similar experiences.
The internet is going crazy with all those rather negative first impressions. "Overhyped", "shit game", "marketing brainwashed everyone", "will be forgotten in 2 months", "only sells because of advertising", "7/10 reviews incoming".