Definitely Mass Effect. Every time a story surfaces about a Mass Effect movie I think; why? It would make a much better TV show. A movie doesn't have nearly enough time to even scrape the surface of the level of depth to the Mass Effect universe. Additionally, Mass Effect has always been as much about the characters and their relationships and development as it has been about the actual plot. A TV series will have plenty of time to explore all of that, in addition to the countless possible adventures said characters could get themselves mixed up in.
Fallout could work, but I don't know that it would be successful. It blends retro-futurism with post-apocalypse in a very unique and stylised way, and I don't think it could draw in a large enough audience to support a show that would doubtless require an enormous budget.
Bioshock could definitely work pre-downfall. It has all the potential for the political intrigue of Game of Thrones, as well as some truly spectacular fights and battles. While I don't think it would have the same level of trouble pulling viewers as a Fallout show, it would probably take your average TV viewer a while to get their head around. Don't forget, your average TV viewer is the reason smart, witty shows like Arrested Development didn't last. Bioshock is about an art-deco steampunk underwater city in the 1950s for complex politic reasons. People there regularly inject themselves with a substance that genetically modifies them with spectacular powers. Brainwashed little girls trot around looking for corpses, escorted by lumbering diving-suited man-monsters. There's a class divide, groups of people facing off for political reasons, everyone has a different idea of what the utopia should be and none of them like each other. To you and I, it sounds fascinating and great. But the average TV viewer was frightened by Arrested Development. So...yeah.
Alan Wake could be pretty fantastic. American Horror Story proved highly serialised horror shows can work on TV, and that they needn't have a brain-shaking budget, either. It's worth noting, thought, that putting Alan Wake (or Silent Hill, which could also work) on TV would put it in direct competition with AHS, a well-received, well-established critical darling.
Splinter Cell would definitely work, but it would have high competition from countless other shows. It would have to land in perfect spot, where it was different enough to stand above and apart from other shows, but be similar enough to them that it won't frighten people away.