Wow, this thread exploded from this morning until now.
I just wanted to say to those who feel 50% is what should be considered an "average" review:
The American educational system is broken down into the following:
(59% and below) Failing
(60-69%) Below Average
(70-79%) Average
(80-89%) Above Average
(90-100%) Exemplary
I think game reviews are scored in a manner similar to this.