Translation quality is the most important factor in a translator's reputation score on the VerbalizeIt platform. VerbalizeIt evaluates all tasks on a scale of 1 to 5 stars based on predefined measures of quality, with 5 stars being the standard level of quality expected. Tasks receiving 4 stars or higher are accepted, while tasks receiving 3 stars or lower require improvements or are failed due to major errors that would need a complete retranslation. Maintaining an average quality score of at least 4 stars on the last five tasks is important for a translator's reputation.