Related Clues:

• JUDGE
• Rapper?
• Motive questioner
• Hairsplitter
• Siskel or Ebert
• Misanthrope
• One making picks and pans
• Negative sort of person
• Detractor
• Certain opening-night attendee
• Backseat driver, e.g.
• Diogenes, notably
• Role played by everyone, it's said
• Nonbeliever
• Knocker