I'd guess the real "we" is the writer of movies speaking through the character about their perspective on critics. So it would be not the critic's view of the profession, but the criticized's view. In this instance, that seemed helpful.

Criticism, like music, can be done poorly by nearly anyone and have little meaning, or by someone who has trained and studied carefully. Consider the source, I guess?

By the by: Did you really just criticize my critical quote on criticism? Recurse you, RodericDay!