The difference is that with all those games you mentioned, there was VERY clear cause and evidence for the hype. Outside of story details, we knew all there was to know about those games months before playing them. There were no secrets, no vague descriptions of the game. We knew 100% what we were getting and THATS why they lived up to the hype.
No Man's Sky is a completely different animal. The hype was born not from detailed and thorough details and explanations and endless gameplay videos (and importantly being a sequel or familiar genre); instead the hype was born from the exact opposite: vague descriptions and hints of gameplay. The hype was not for what the game WAS, but what it COULD BE in gamers' minds. It was never going to live up to the hype in that regard.
For what it's worth, I'm really enjoying the game. Yes, there are things I wish it could have done, but for what it is, I think it's damn fine.