Final answer:
Summative comments should be based on a careful evaluation and analysis of the work, providing specific feedback and revision suggestions.
Step-by-step explanation:
The summative comments should be based on a careful evaluation and analysis of the work being reviewed. They should provide specific and clear feedback on what is working or not working in the writing, along with suggestions for revision. Open-mindedness, constructive criticism, and research to back up opinions are key qualities of a good critic or reviewer.