Tyler says: Before I chime in, I urge you to read
Rob's full article. But, as great as the article it is, the piece tells us mostly what we already knew: familiar things sell, new, unique ideas generally don't do as well.
Take Boom Blox: Bash Party, it was one of the highest-rated games on Metacritic in May, but sold half the copies that Night at the Museum: Battle of the Smithsonian did (and Night at the Museum scored a 52 on Metacritic, as opposed to Boom Blox's score of 86).
The focus of the study was to see if developers and publishers are justified to gauge bonuses or employee pay on aggregate review scores. However, I doubt most will heed this information. Like it or not, publishers and developers want to see those big numbers on Metacritic, even if they have no bearing on their titles' success at retail.