By far, it has to be broken steel. it not only continues the main quest line, it increases the level cap to 30. it aslo lets you keep playing with (i think) 7 hrs of extra game play, gives axess of new characters and locations but best of all NEW WEAPONS. these new weapons are some of the greatest and powerful weapons it the game. so broken steel it the best dlc
Broken Steel by far because it continued the game rather than ended it!
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Personally it it self preference, but i find that Broken Steel is the best add on as it extends past the main storyline and introduces new challenges, weapons and enemies. As well as this it is fairly long making it worth its money. The worst add on in Mothership Zeta as it has a boring storyline and easy to kill enemies with the exception of fairly decent weapons.