This last season is a touch better than the recent ones, but then you literally have Evvie who is, to a T, a Cochran, and (for a while) one of the main questions in their audition packet was “which former Survivor player do you think you would play like.” For a long while, the vast majority of the US casts were recruits from casting directors looking for specific types to fit desired “characters.”
Season 4 of AU has a three/four folks that feel like they’re intentionally playing a “character,” and Luke is the only one who’s personality isn’t portrayed like a joke. AU may get worse, but right now, everything feels far more genuine.