Not very engaging, poor script, poor character development, some scenes are good but lacks depth with poor CGI effects. And mostly scientifically incorrect. Virus always try to attack diseased host, not the fresh healthy host diseased persons are immunocompromised and virus can easily replicate within them.
Moreover , the struggle for survival of human in zombie world is less explored with this film, the emotional development of character can't be related with pre zombie situation. I better suggest "Train to busan" is far better movie in this zombie genre of films