If they don't dumb down the game, I'm guessing it will get middle to low 80s, based on FROM's reputation alone. If they do dumb it down, I'll be sad, but it'll probably score ~90. It will probably deserve low to mid 80s. Take from that what you will.
That said, I don't give 2 shits what modern game "journalists" say about it, so I'll make up my own mind, and I'm going to buy it anyways because I enjoyed the old games. Maybe I didn't 'love' them, but I'll take any mecha games I can get at this point, and this is probably the first time they had any real budget to throw an an AC game. I'm excited to see how it turns out.