10's arent just the fun factor
its not that hard to make a mindless fun game we get them all the time. To be 10 it has to be ahead of its time and everything has to come together to offer a deeper experience
and the length of a game shouldn't mean much either lets take Bioshock and ICO for example
To name a few
LOZ: OoT
LOZ: TP
LOZ: WW
Ratchet and Clank: Up your arsenal
Soul Caliber
Halo:CE
God of War
FFX
GTA 3
Super Mario 64
Street Fighter 2
Metal Gear Solid
Bioshock
Skies of Arcadia
Half-Life 2