Gah this is a toughie, and I'm bound to leave some out of course I've sort of gone with Tokyochojin's way of thinking in as much as
Although I have bunged my own in as well 
Super Mario World
Street Fighter II
Final Fantasy VII
Okami (PS2 version)
Super Mario Galaxy 2
Resident Evil 4
Super Mario Kart
Mike Tyson's Punch Out!
The Secret of Monkey Island 2: Le Chuck's Revenge
Katamari Damacy
*11. God of War II
As I say, sure I've forgotten a load and also rans would include:
Final Fight (Arcade and Mega-CD)
Wrestlefest (Arcade)
Daytona USA (Arcade)
Sega Rally (Arcade)
Street Fighter Zero 3 (Saturn)
COD: Modern Warfare
Metal Gear Solid
Ultimate Muscle (Gamecube -not really sure it's a 10, but piling time into this)
Pikmin 2
Burnout 3: Takedown
There is of course hundreds more such as Bubble Bobble, Elevator Action Returns, Rez, Parappa the Rapper etc. but I have to stop somewhere!
My "perfect" 10, not necessarily games that I like, but those that were revolutionary, or technically and creatively a level above their time.

Super Mario World
Street Fighter II
Final Fantasy VII
Okami (PS2 version)
Super Mario Galaxy 2
Resident Evil 4
Super Mario Kart
Mike Tyson's Punch Out!
The Secret of Monkey Island 2: Le Chuck's Revenge
Katamari Damacy
*11. God of War II
As I say, sure I've forgotten a load and also rans would include:
Final Fight (Arcade and Mega-CD)
Wrestlefest (Arcade)
Daytona USA (Arcade)
Sega Rally (Arcade)
Street Fighter Zero 3 (Saturn)
COD: Modern Warfare
Metal Gear Solid
Ultimate Muscle (Gamecube -not really sure it's a 10, but piling time into this)
Pikmin 2
Burnout 3: Takedown
There is of course hundreds more such as Bubble Bobble, Elevator Action Returns, Rez, Parappa the Rapper etc. but I have to stop somewhere!
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