Judging by the analysis of Gamespot's reviews above, Gamespot is no more biased than IGN. I was running a data sheet on a few different consoles and found that the average for the three "next-gen" consoles were as follows:
Wii: 6.485897436
Xbox 360: 7.301898734
PS3: 7.477586207
The only difference between IGN and Gamespot appears to be that IGN has given the Wii's flagship games slightly higher reviews which has saved it from the wrath of fanboys.
Assuming that this discrepancy between average reviews is present on all the major consoles, it would indicate that either everyone has a bias against the Wii (unlikely) or the more reasonable conclusion that the Wii simply has not managed to reach its potential and has failed to provide consistently worthwhile gaming experiences. Perhaps the answer simply lies in the idea that motion controlling remains a little overrated at this point in time.
