1. Yes, Polygon should have only posted a review of Simcity based on real-word playing.
2. Changing\updating scores is a GOOD THING that every review site must do where applicable.
#2 is not a good thing when it is used as an excuse to not do your due diligence and review the actual product people will be playing. Updating review scores should be used in cases of games like TF2 or Burnout Paradise receiving excellent post release support, not to cover up the reviewer's mistake to review a game on pre-release servers.