My nod goes to the Grand Theft Auto series. As we all know, the current games enjoy immense critical and popular acclaim. The earlier games in the series, however, were generally regarded as poor executions of what was then a novel concept. The first three Grand Theft Auto games are held in somewhat higher regard now than when they were released, but I think that is the result of hindsight bias, with the current games' excellence having been undeservedly imputed back.