A scale by .5 is no good. Way too simplistic.
Maybe I'll get back into reviewing here at another time. I don't know....
To me, there is a big difference between something I'd call a 9.0 and a 9.2.
Not only that, it basically doesn't scale well with the many reviews people have done recently. Some people (ok a minority) put in a ton of thought and effort into their reviews. Now where do those numbers stand?
Why not just do this for reviews of very old games?