Your right. However, I do think it'll score higher than most super hero games. Hopefully it scores higher than Arkham Knight.
I think it will score well, but I doubt it will be high 80's. This game has some shortcomings that we already know about, like the lacking side missions (at least that's what I get from previews) and a lack of a dynamic day/night cycle which is pretty standard now days. The game could also be short. Which would deducte from its score.
The gameplay and production quality seem very high and insomniac seem to be trying very hard to be truthful to the source material. Which could benefit the game a lot.
To me there just seems a lot of variables. But if it scored 80 or higher than I think this game will go on and sell a shame ton.