1. Are there any good stats on games that have had their average score change a lot over time? A couple of slow burn games are SotN and Ico, for example.

2. In this graph based on MC data, are scores from years after the game was released counted? And where can I find the original page for this graph?
https://i.imgur.com/oH3onC7.png
https://www.reddit.com/r/gaming/comments/2kh29h/average_metacritic_scores_20012014_courtesy_of/

https://twitter.com/Lokno/

Twits were from 23 Oct 2014-ish

Example: https://twitter.com/Lokno/status/525473913477017601

Most of the articles who wrote something about the graph linked to the twitter account.

Oh I see, thought it was on the MC site somewhere.

Metacritic is useless as an aggregator; there's no way to tell how they translate reviews from stars, X of Y scores, and so on.

Pretty sure they have a page explaining that.