I hate giving scores, but I think 70/100 is pretty fair, and I'm in love with the game.
It's not for everyone. Not every game is for everyone. Not every game is going to have every feature you adore about games. I learned a long time ago to walk away from games that weren't doing it for me. Just recently, I deleted Stein's Gate from my Vita, because I just wasn't feeling it. I love visual novels, but after about 3 or 4 chapters, I realized that it wasn't doing it for me story or character wise, so I dropped it. Nothing wrong with that.
With No Man's Sky, the genre, setting, and visual aesthetic are what initially roped me in. Now, after having spent about 10 or so hours with the finished game, I can definitely say that I love the game. It's repetitive and grindy, but that urge to explore and discover new stuff and upgrade my suit, ship, and multitool, and learn languages still has me engaged. I used to think that Demon's Souls wouldn't be my type of game, but I gave it a shot and ended up falling in love with the Souls series, with Bloodborne being my favorite of that style of game. I know a LOT of people that don't like Souls games, but instead of trying to force my love of the series onto them, I just let them enjoy what they enjoy, and pass on.
Personally, I think a 7/10 is a pretty good score. The game is rough around the edges, and has a lot of little niggles that I'd love to see ironed out, but I'm surprised at how much more to it there is than I thought. The Atlas Path is pretty vital for people that don't want to just go into the game blind, and want a little bit more guidance or some kind of other objectives to pursue. When I review games, I use a "Buy/Rent/Pass" system in my final verdict. I want to spend more time with the game, and I will tonight and this weekend, but my 10+ hour verdict would be:
Buy - If you are a fan of exploration, beautiful music art design, and a really satisfying sense of discovery. If you ever wanted to just hop in a space ship and explore the stars, this is a very cathartic title for that. There's just something really enjoyable about cresting a hill and seeing a beautiful, alien landscape, or a massive ocean with mountains in the distance, and starships flying by overhead.
Rent - If you want more meat in your games as far as quest lines, story, and aren't a fan of having to work to unearth some of the more satisfying upgrades/tools/ships. If you're curious but don't want to buy right away, or the $60 price tag is a deterrent.
Pass - If you want a multi-player experience and deep and complex gameplay systems, sprawling alien civilizations, and a more hand crafted experience. Also, if procedural generation isn't your cup of tea. If you haven't been impressed by what you've seen of the game so far, chances are it's not for you. It is exactly as the trailers have made it look. Exactly. Whether that's a good thing or bad thing is up to the individual.