That poll has less than 20,000 voters on it, is from a site where less than half of that have ever heard of, and has absolutely no merit towards any real decision on the non-existent "game of the decade" category. Seriously.
Let's not forget that this is an ONLINE POLL, meaning more than likely, at least 4000 total votes are dupes. Let's also just ignore the fact that the games themselves are 100% incomparable, don't resemble each other in any way, and that this poll is simply fanboys vs. fanboys.