21 is an American motion picture drama about an MIT student's attempt to out-smart Las Vegas blackjack games. This page contains reviews and links to reviews for the movie.

According to critical review aggregator sites like Rotten Tomatoes and Metacritic, 21 was not well received by the critics. Fans of light caper films like Ocean's 11 carried the day and the film earned back its budget in the first two weeks of theatrical release.

• RogerEbert.com: 21 Review
  • "Inspired by the real-life story of the M.I.T. students who took Las Vegas casinos for millions, 21 has been reshaped to fit a simple movie template – and it's nearly as much fun as watching an insurance professional compute actuarial tables."
• USA Today: 21 Review
  • "Repetitive, implausible and overlong. "
• The Washington Post: 21 Review
  • "It's a would-be parable about greed that emptily celebrates it, a drama about gifted people who are one-dimensional voids and, most laughable of all, a story about the giddiness of risk-taking that safely plays everything by the numbers. "
• The Village Voice: 21 Review
  • "A movie that wastes a lot of time and money and really, really shoulda stayed in Vegas."
• E! Online: 21 Review
  • "It's disposable, watchable and forgettable filmmaking for would-be easy millionaires."

• Creative Loafing: 21 Review
  • "Manages to make the act of counting cards seem as exciting as this past winter's Super Bowl – and as perilous as climbing Mount Everest with both eyes closed. "
• Rolling Stone: 21 Review
  • "Loosely adapted from Ben Mezrich's best-selling Bringing Down the House, the movie stretches facts like taffy but never shirks its responsibility to entertain."
• Variety: 21 Review
  • "...shrewdly shuffles together attractive young leads, cagey screen vets and a fantasy-fulfillment scenario in a slickly polished package..."