What went wrong?

The original didn't need an update and everyone is sick of reboots.

Well for one thing, judging by that still in your picture, they added shit that wasn't in the book.

I never fucking understand why so many adaptations change shit that doesn't need to be changed, for no reason that I can think of.

Yeah,
WHAT WAS THE POINT OF THE KIDS IN ANIMAL MASKS

I read somewhere that they couldn’t get the Gage actor to act well.

That’s what happened when parents these days are shit.

Oh. Well, I guess that's at least a semi-valid excuse. They should have put more effort into casting, then, but at the end of the day I understand that there's only so much you can do.

Elaborate

Everyone dies/becomes a zombie

How?

Zombie Daughter and Zombie Mom kill Dad, then bury him in the Pet Cemetery. Dad comes back as Zombie. Approaches car that has the still living son in it.