From what i played:
Mass Effect - Bring the down the Sky.
The decision that you have to make in the end. To sacrifice a few hostages to kill a madman or vice versa.
Mass Effect 2 - Overlord.
Loved the history that enfolds while you progress through the dlc.
Fallout:NV - Old World Blues.
The sorrounding, the jokes, the enemies (according with wiki can be hard past +35).This dlc is a must have.
Fallout:NV - Honest Hearts.
I really liked the lore with "Father" how he look after the tribe lefting "gifts", teaching them.
Dont know if The Witcher 2 Dark mode and arena is consider bonus content but its one hell of a mode.
Post edited January 31, 2013 by soulitter