graphics are compared within games on the console. So a Wii game's graphics score is based on other Wii games.
I don't think we take full surround into account, technical presentation usually is a place for framerate issues and bugs of any kind.
For your last question, no we are not Edge, we use numbers like most other sites, it that means a 5 point scale +5 then sure. The average as I see it is 7.0 so I do it like the American grading system I guess.
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