Range voting is one of the few systems that requires strategic voting with only two candidates. This isn't a good thing. :/

  Demographic A (10 voters): Candidate X valued at 40, Y at 60
  Demographic B (3 voters): Candidate X valued at 100, Y at 0

  Candidate X gets 700 points
  Candidate Y gets 600 points

This scenario demonstrates how susceptible range voting is to tactical voting.