my point being that a 4/5 from most sites that use that scale does NOT mean the same thing that an 80/100 means from sites that use a 100-scale.
Mathematically, sure, the two numbers are equal, but the meaning behind the scores is not.
Plus there's the fact that even some publications that use the same number scale assign scores differently. 8/10 from Eurogamer means a lot more than 8/10 from IGN.
--
http://i49.tinypic.com/anio39.gif