Final answer:
Projective tests are criticized for their low validity and objectivity, largely due to the subjective nature of their scoring and interpretation.
Step-by-step explanation:
The major disadvantage of projective tests is that validity and objectivity are typically low. These tests use ambiguous stimuli to reveal a person's unconscious thoughts and feelings. The Rorschach Inkblot Test and the Thematic Apperception Test (TAT) are examples of projective tests.
One of the key issues with projective tests is the subjectivity in scoring. Unlike self-report inventories that have clear, structured formats like true/false or Likert scales, projective tests require the evaluator to interpret responses, which can lead to a high degree of variability and potential bias in the results. While the Exner scoring system for the Rorschach test has improved its validity and reliability, the overall scoring of projective tests often lacks standardization and objectivity, which makes them less reliable and valid compared to more structured psychological assessments.