I mean, we know for a fact that the X1 version's visuals, if they end up as bad as what we've been shown so far, is going to get that one's review scores hammered. There's no escaping that.
As far as gameplay, it really depends if the ARPG angle works. If it's not a clunky mess, which remains to be proven, then you will probably get reviewers who aren't long-time fans of the series praising it for being a new entry point for converts to the series, and long-time fans giving it bonus points for exceeding their expectations and being proven wrong.
If the combat sucks, however, you'll get waves of "I-told-you-so's' from long-time fans who have always predicted that ARPG was the wrong way to go. It'll get raked over the coals. You can have as many anime spinoffs or photorealistic cutscenes of sandwiches as you want, but the jig is up if the combat isn't good.
It's too early to tell if the story will put people off. We've seen some good voice acting and we've seen some bad. We've seen good mocap work, we've also seen Iris flailing her arms around like a Sim. For something going for western-realism, the quality of the animation and the voice work is going to make or break the storytelling.
I can see why reviews will be extreme, but based on the pushed back release date and extremely dodgy promotional material, I'd expect more on the bad end. Though I'd love to be wrong.