There is no way FIFA 08 is going to beat Super Metroid. Sports games in general are in an awkward position when it comes to a video games tournament because there will always be improvements in next year's edition. Mostly everybody buys the 09' edition of a sports game and sells their 08' game around the same time, it's only natural, there are not very many people who still play Madden 05' do they? I don't think so, which makes it difficult for me to vote for a sports game. Not being a big soccer fan is another reason why I am not voting for FIFA.
Super Metroid actually has the potential to go really far in this tourny, but I am afraid that not many people are familiar with the franchise, but we'll see when the voting is done. Super Metroid is an excellent game, Samus Aran is the best female protaganist in video game history, and for a good reason: All of her games kick ass, Metroid is one of the few big franchises that never had a bad game made yet. Super Metroid wins easily.