Hm, another possible explanation is that Edge isn't biased, they just thought the PS3 games were worse than the 360 games. Shock!
That's called a 'result', something that comes AFTER examining / testing.
'Bias' means judging BEFORE you tried it.
You know, according to your (very popular) definition of 'bias', any comparison that doesn't result in "all contestants are equally good" is biased. That's pointless.
Currently playing: NSMB (Wii)