Should more games be rated AO?

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I don't think so.

AO is akin to a 'NR-17' rating in Movies. Gears of War is more like a typical 'M-18' game or a 'R' rated movie.

'AO' should be reserved for games with glaring sexual content and/or violence that is so perverse that it could be a snuff film, i.e. Manhunt 2.