I've always thought it was fairly ridiculous that people obsess over the aggregate score on Metacritic as if it was the be all and end all, while ignoring what makes that site so super awesome - it compiles an enormous list of reviews in one place.
Who gives a crap what the overall average winds up as, I cherish being veritably inundated with reviews without needing to bookmark or otherwise know about all the various websites that decide to review things - as a content aggregation service Metacritic is quite handy.
Numerical scores are mostly meaningless anyways - everyone isn't using the same scale to begin with, and human beings don't generally quantify their experiences by assigning numerical values to them; if I go on a vacation, I'm not going to tell my coworkers about it by saying "I give it 88 out of 100", no one actually does that. A higher/lower overall rating on Metacritic tells me squat all about how much better/worse any two games are than each other, or whether I'd even like the damn thing - the number by itself is not a meaningful system of comparison and information delivery.
Now if the same person gives two directly comparable titles vastly disparate scores that don't seem to reflect either prevailing opinion or, you know, reality, that's another matter entirely since there's context for that arbitrary numeric value, but the overall score on Metacritic isn't like that at all.