I NEVER buy games based on metacritic.
I would never buy a game based solely on a metacritic number. That's silly. Otoh, knowing a game has gotten stellar reviews does influence my buying decisions. It's why I always end up buying GTA, even though I haven't liked the earlier ones. It has something to do with why I'll buy this game, or at least
when I will buy it. I'm certainly more eager to play it now than I would be if the mc average was 70.
Likewise, bad or mediocre reviews can also cause me to hold off or avoid buying. It's usually a matter of reading the reviews and becoming aware of the game's problems, rather than just making decisions based on a score alone, but the score reflects the problems.
I posted this in the Sales thread, but small differences in metacritic averages above 90 (e.g., a two-point difference) do significantly impact sales. I shouldn't say "impact," though -- that gives the impression that metacritic averages
cause sales to rise, or in other words that people are buying the game
based on metacritic averages. That's not what's happening.
It's correlation, not causation. The most likely explanation is that metacritic averages are a marker for things that actually drive sales -- like high quality, high production values, publicity, positive press, wide-spread acclaim etc. It's not the metacritic average itself that causes people to buy a game, but the factors that are associated with very high metacritic scores.