While 5 should be average, considering that almost no one actually seems to give a score below five on even a semi-regular basis, to consider 5 an average is...well, kind of stupid. I've never seen a game get a 1. Then again, my philosophy towards game review scores is essentially, "Screw you, you don't know my taste in videogames." Much the same as movie reviewers, actually. I tend to go by word of mouth, and whether I've seen the gameplay.
As far as movie reviews go, I tend to listen to MovieBob though. Our taste is movies is very similar, although I'm not a fan of comics, so the superhero stuff is only as cool or disappointing as it can be for someone who doesn't know the canon.