Someone with critical faculties is objective.
We're discussing a TV show. Ultimately opinions as such wouldn't be objective, because it's down to interpretation. You can say there can be objectiveness in things like how well the plot holds together or how good the CGI looks, but ultimately people judge these things differently and place different emphasis on what areas are more important to them for them to like it. If there was any objectivity about it, we'd all know immediately whether it was good or bad and agree.