Bias is universal. Being as open as you can with both yourself and others as to what those biases are is the foundation of honesty.
Said another way, all movie reviews are biased because we all have different tastes and preferences, we have all seen different movies which colors how we perceive new movies, we all have different values and limits, the list goes on. I like movie reviewers with a strong opinion, even/especially if that opinion does not agree with my own. Because I understand their strong opinions (their biases), I can easily apply my own analysis and decision-making to their opinion.
Said another way, all movie reviews are biased because we all have different tastes and preferences, we have all seen different movies which colors how we perceive new movies, we all have different values and limits, the list goes on. I like movie reviewers with a strong opinion, even/especially if that opinion does not agree with my own. Because I understand their strong opinions (their biases), I can easily apply my own analysis and decision-making to their opinion.