I realise my response seems more targeted towards sales than reviews, but it covers both sides.
I mean you could suggest that some niche android-powered device might so neatly fit some weird need that it gets full marks from the 3 people who buy it, which would be higher than the average of all iPhone reviews. But the example in the article is the multi-million selling Galaxy S.
(Note also it's UK focused, so AT&T versus Verizon doesn't apply)