Some brief analysis based on IGN reviews:
Xbox: Wii: PS3:
90+ 14 3 3
80+ 69 17 24
70+ 103 38 45
60+ 133 49 51
50+ 152 67 56
40+ 158 69 58
30+ 160 78 59
20+ 162 80 59
Note these results counted games only once, so where games had multiple reviews I used the US review. These results also do not include XBLA, VC, or PSN games. I also did this in a hurry so I apologise for any mistakes but I do not think there are any :)
The only last generation console I have on my database is the Dreamcast (which has awesome results) so I cannot compare any of the information against the PS2, GC or Xbox.
