A lot of people don't like Zagreus but I think this largely spurned by the fact it didn't meet particular expectations people had (i.e. lots of Doctor/Doctor/Doctor/Doctor interaction). Personally, I love the story for what it is and it's a satisfying (albeit not perfect) conclusion to the fantastic Neverland.
I don't know about "A lot of people," but I hate Zagreus
because it is four hours of bad dialogue and worse characterization.