What is a critical review?

The critical review can be of:

It is an activity to call or attract the public's attention to something, generally a product or service.

short for "opposite the editorial page" a piece of writing that expresses a personal opinion and is usually printed in a newspaper opposite the page on which the editorial is printed

It is a marketing term for its target consumer to make desired action.  Or is where you precisely explain to the audience what part they can perform after your speak.

It is also known as an argumentative essay, uses logic and reason to prove the superiority of one theory over another. It makes an effort to influence the reader to adopt a specific viewpoint or to act in a particular way. 

It is to influence your audience's attitudes, beliefs, values, or judgments. For example, the prosecuting lawyer would attempt to persuade the jury during this speech that the prisoner was guilty beyond a reasonable doubt.

Information spread to influence public opinion, including arguments, rumors, half-truths, and facts. 

It is a message you write to a newspaper or other publication to share your view on a current issue you feel is important in your community, state, or country.