If I were to re-review NMS myself after all this time, I'd move it up to a soft 4/5.
The biggest problem for NMS, I feel, is its lack of diversity in world, fauna, and flora creation. Terris touched on the world issue here, but there is just an overall 'sameness' despite the procedural generation. While it has improved over 1.0 in these areas, even my explore-loving heart gets bored cataloging recolors of the same flora or rocks or slightly different fauna. I still get surprised or wow'd from time to time, after about 300 hours over the past three years, but those are rare occasions.
The second biggest problem, and a technical one, is the pop-in. It's gotten worse and worse over time. I have to spend 20-60 seconds circling around a landing pad before it's fully popped in; I can suddenly smack my ship into trees that weren't there ten seconds before, etc. Even though I'm used to the pop in, it just adds another element that drains the fun out of the game - get to a place, wait up to a minute before I can 'use' the place, rinse, repeat.
