Avatar Watch: Day One

Rotten Tomatoes currently has Avatar ranking at 91%, pretty stellar for any movie.  But early reviews are notoriously overly positive, and as opening night approaches the ranking almost always goes down.  I don't know why that is- presumably, critics have all seen the movie around the same time, so I would assume the rating would stay about the same; but it almost never does.   Is Avatar good enought to resist the trend?  I'll look at it each day to see.  I predict it will go down at least 1% each day until Friday, giving it an opening-night RT ranking of 86%.