Of course, this could have been the best of Fallout's downloads. They all could have. It's not easy giving consecutive middling scores to these updates because, as DLC goes, they're more generous, creative and adventurous than most. Released according to a gamer's schedule rather than a developer's, each coming mere weeks after the last, they beg for whatever sympathy you can salvage. But in the case of Mothership Zeta, for all the love that's gone into it, that's as uncertain an amount as ever.