It looks like critics and non-critics both agree: Breaking Bad gets better and better, season by season. The IMDb scores are from your average, everyday person. The Metacritic scores are from –well– critics.
Note: IMDb allows users to rate on a scale of 1-10. I simply multiplied the IMDb season averages by 10 in order for the data to correspond with Metacritic’s 1-100 scale. Therefore, IMDb average user ratings are 8.6/10 for season 1, 8.7/10 for season 2, and so on.