The GameSpot "Greatest Game Series of the Decade" poll is nearing its end now, and the finalists are The Elder Scrolls
versus Grand Theft Auto
So, if you want to take part in deciding which game series is the greatest (of these two), head over to GameSpot
Both of these series have been moddable for quite some time, and have both seen some great mods being produced. Whether or not that is an important factor as to why they appear at the top of the bracket is unproven, but personally, I think it has been a key factor for the success of both series, and will continue to be so.
Now, those two series are the finalists, but they have been competing with series like Fallout, Mass Effect, Total War, Assassin's Creed, Battlefield, etc. Do you agree with the outcome so far, or is another series your favorite?