They are expected to state both what works and what doesn't work. Reviewing Katherine Johnstone's art show last month, Lori Johnston commented favorably on two works that ''feature original characters'' but had to note that ''the bulk of the works are academically stimulating. The reviewer regularly has to separate performance from material. Johnston observed rough edges in a July preview of ''Greater Tuna'' and hoped that the missteps would be overcome as the run went on. Seemingly extraneous considerations can deserve major attention, especially in Sullivan Arena.
All reviewers grapple with nuances of taste and subtlety.
An editor rejoices when the reviewer goes out on a limb, as in Catherine Stadem's review of ''Noises Off'' in March. Despite a tentative start and diction problems, Stadem praised the overall effort as ''a giant step'' for the fledgling Kokopelli Theatre Company. You Be the Critic'' letter. Mail it to the News at P.O. Box 149001, Anchorage, AK 99514-9001. We revel in the feedback.