Giant bomb gave it 3 stars just due to technical issues. Just shows how borked it is to use score aggregators. I feel like gaming reviews need an overhaul,and updating reviews should be common. I wonder if opencritic updates scores with updated reviews...
Game is definitely a 9.0/10 from me anyway. Would maybe be 9.3 or higher if it weren't for the technical issues. Its extremely well put together, it feels fantastic to play and the story is great. Levels design is top notch, even if it is quite game-y. But it doesn't do anything unique or new, really, which is why it can't reach a 9.5+.
Still, its my GOTY now, and I think Sekiro is probably the only game that could top it. 9.0/10 would be my lowest score for my personal GOTY since 2013, and that was due to waiting for the remastered versions of TLOU and GTAV, and I think I scored Black Flag higher at the time as well. Soif you don't count that then this would be my lowest GOTY that I can remember since I started properly playing games. Yeesh. Funny, I think this year also set a new record for me for number of games in the 8.0-9.0 range. So many very good but not amazing games this year...