That'd be a bit of a setback for 38 Studios if that happens, imo. 70-80 aren't necessarily bad scores, but they need to knock it out of the park with the reviews. It's a new IP, new company, looks a bit generic at surface glance, and the screenshots/trailers don't really do it justice. I think they need to hit the 90%+ in order to get the general audiences attention.
I can't say whether the game will deserve great scores or not, but I hope it does. I like the dev team and their philosophy, and I hope this pans out for their sake...especially since they have a lot of plans for the future. A bomb here could be pretty demoralizing for a new upstart studio.
I hate to admit it, but I might be part of the problem. I'm considering waiting for a price drop or until the first patch comes in if it turns out the bugs and camera issues from the demo persist. Oddly enough, Amazon isn't offering any of those preorder $10/20 bonuses like it does for a lot of other games. I'd probably have bought in at that promo. But seeing how it's pretty high on the preorder rankings already, I guess they don't really have to.