General:
* Assessment
* Evaluation
* Review
* Estimation
* Valuation
* Judgment
* Critique
* Analysis
Formal:
* Audit
* Survey
* Inspection
* Examination
* Inventory
* Inventorying
Specific to real estate:
* Valuation
* Property assessment
* Market analysis
* Comparative market analysis (CMA)
Specific to performance:
* Performance review
* Performance evaluation
* Feedback
* Feedback session
* Employee review
Informal:
* Opinion
* Judgment
* View
* Take
* Impression
More specific to value:
* Pricing
* Estimation
* Prizing
* Rate
The best synonym to use will depend on the specific context. For example, if you are talking about the appraisal of a piece of real estate, you might use the word "valuation" or "assessment." If you are talking about a performance appraisal, you might use the word "review" or "evaluation."