Question: Why would you use Google Scholar for theater criticism?
Answer: Google Scholar identifies scholarly research materials from a broad range of subject areas.
Google Scholar also offers a "cited by" feature - it will display a list of documents which cited the document you originally retrieved. This can be useful in determing how influential a source has been. The list only includes documents available in Google Scholar, though.
Newspapers provide recent critical reviews of plays, playwrights, and performances, and document openings of performances in theater arts.