As a long time Elite Dangerous player, i didn't have high expectations for Odyssey, given Fdev's previous track record with the game. As such as wasn't surprised by what we got at launch.
The best thing to be said about it is that is was functional at release, though quite content dry. Being able to finally get out in stations on foot (in the concourse only currently, I'm afraid) was/is great, and the on foot combat is decent, though again, lacking in content. The usual "Fdev's special" amounts of grind is present everywhere, unfortunately, and that really drags down the game as a whole everywhere. Not just with Odyssey.
All that said, i still can't give it a 1 star, because i know the game is _still_ growing (at a glacier's pace. But still) after 7 years, and Odyssey is a big expansion that still hasn't fully released everything it is supposed to bring. So there is still time for it to improve, and there is promising signs of legitimate improvement.