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Mature:

Bioshock, Half-life franchise, most good Survival-horror games, Eternal Darkness (good enough it needed to be separated from the others), System Shock, Call of Duty 4, etc.  Any game that uses it's M rating to have mature themes and a deep fleshed-out plot.

As well as the tongue-in-cheek games that go so over-the-top it's humorous like Conker's Bad Furday and No More Heroes

Immature:

Pretty much everything else. Anything that substitutes blood and boobs for actual quality gameplay (God of War) or is filled with beefy testosterone-filled men to get teenage hormones going (Gears of War), and of course GTA...