9. Broken Steel - Fallout 3
There's an argument to be made that Fallout 3's base game ending was poor, as you, well - supposedly, anyway - just died. Broken Steel rectified this, along with extending the game in general.
With this DLC, people were now able to continue Fallout 3 with the addition of an increased level cap and the continuation of the Brotherhood of Steel storyline, giving players the ability to officially join the ranks of the Brotherhood to rid the Capital Wasteland of the Enclave remnants.
Around a five hour DLC and the new sidequests taking up to an hour as well. New enemies, new armour, new weapons and the inclusion of the communist eradicator Liberty Prime, now for less than a fiver.