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For example, whether something is objectively good or bad. This can include a set of criteria, such as originality, technical execution, balance of components, and so on, which can often be determined even if it doesn't personally resonate with you. If you feel that objectively it's at a level that doesn't allow you to simply lower or inflate the rating based solely on the fact that it's "not your cup of tea," then you can use that as a starting point and adjust the rating according to your preferences.