I don't play that many games simultaneously. I'll usually play one shooter, like Fallout: New Vegas or Bioshock 2 over the course of a month and then move on to another.
I'm not an avid gamer... but when I do play I like chapters to load quickly. To give you an idea of how old school I am... I'm patiently waiting for Doom 4, Quake 5, Fallout 4, Bioshock Infinite... and the ultimate pipe dream, Half-Life 3!