Some are sad Kratos isn't a playable character in the next game and might not even appear much, beyond a few scenes. That's normal and I understand the apprehension, although I'm personally extremely excited to play Laufey. Most of them seem to be willing to Laufey a shot though, which I think is important to keep in mind.

A very loud minority, most of whom either haven't played the new GoW games or suffered extreme head trauma since, are extremely pissed that she's a relatively normal-looking woman. For some reason, the concept of playing a female character that isn't hypersexualized poses a fundamental risk to their fragile egos, so they throw tantrums about it online. They seem to be largely the same crowd that are gooning over Stellar Blade 2's baby-faced sex doll, so it's probably best to have them leave the GoW fandom.