Othello is a major Shakespearean text, studied widely and often adapted for film and TV and is especially challenging for a multicultural society. Othello lends itself to criticism through discussion of the major characters although this study also focuses on recent criticism's analysis of the characters as "signifiers". The study of the key characters takes the discussion of the text immediately into the central issues of "otherness", gender, race and power.
I read the early chapters on Iago (not Desdemona, Othello, or the minor characters). Potter reads Iago through various positions/critics and approaches: e.g. Romantic, particularly Coleridge's, Freudian, Marxist, etc. It definitely got me thinking about the character in other ways than as "evil" or as "motivated" by desire for preferment or sexual jealousy - which is what I wanted to do.