Eh, I don't think the general fan base really complained about The Force Awakens. There's a small group of fans like myself and a wider swath of the general public that certainly thought it was too samey, but most people ate that shit up.
So, I'm really thinking what the critics are saying, that Rian Johnson reinvents Star Wars and does something daring, is what likely happens here. The sort of people whining that it's "too different" are the sort that just get excited by the 38 Marvel films adhering to the exact same model because it's comfortable. And that's not an opinion I really care about.
For what it's worth, Rotten Tomatoes attracts a larger and less discerning group to their user scores/user polls than Metacritic does, hence why the latter's base was harsher to The Force Awakens. So, if anything, I would expect the Metacritic user score to go up quite a bit once the non-fanboys have their say in the ensuing weeks.