Metacritic ends up horrendously skewed in a number of ways.
1. IIRC, Metacritic only accepts the first review a website puts out. If any of those reviews were revised, the aggregate score is off.
2. Metacritic averages out the rating system into its own rating system. 1 star is 20%, 5 stars is 100%. 9/10 is always 90, no matter what, etc.