Maybe just use Gamerankings and Metacritic?
All the work is already done: just add both, and the overall percentage should be quite accurate...
If you really want to do it the hard way, with 10 to 20 sources, and add some european reviews into the mix, in french, i usually visit these two "big" sites:
http://www.jeuxvideo.com/etajvbis.htm
http://www.gamekult.com/
Of course, there are a few others, but these two have usually decent reviews and scores...
And i agree about Famitsu, we need at least one japanese source as well...
Btw, my favorite site for Wii reviews is:
http://www.thewiire.com/gameslist.php?display=reviews&sort=desc
It never appears in Gamerankings or Metacritic, so... but of course, it's Wii, and Wii only...
"A beautiful drawing in 480i will stay beautiful forever...
and an ugly drawing in 1080p will stay ugly forever..."
