Exactly though. A review is simply a published opinion. There's nothing which says one review/opinion is more valid than another.
Personally, I detested All-Star Superman but not because of the story. I loved the story but the art never sat well with me because I can't stand Quitely. Comics being a merging of visual and written mediums need both to appeal to the reader so if one doesn't work then it can ruin the entire experience for a person. For me, Jim Lee's art overwhelms any minor flaws in the story and makes me feel more attached to Unchained than All-Star because of it.