There are quite a few people who got this game early (here and on Reddit) and everyone says that Greedfall is a marked improvement over all previous Spiders' games. I believe that most mainstream review sources have a bit of a negative bias towards the so-called "euro-jank", so I would be surprised if Greedfall breaks 75 on Meta/Opencritic. Still, with a bit of luck it might do that. My hope is for an 80+ score, but that's probably unlikely.
I've studied quite a few early impressions and from them I expect this game to be a solid 9 for me personally (if its quality is consistent throughout). I've already preordered it, as I know that I want to play it in any case to try it out for myself, even if it reviews poorly after all.