Nothing can beat the replayablility of skyrim, its such a large game with too many different options to be able to have everything done in the first play through. Another game I love is fallout NV you can also play that game far more times than others I have encountered. The thing I love about open world games is that there is always something "extra to do" unlike fps games where once you beat the story once playing it again for minute changes or no changes at all gets so damn boring. Thats why I don't understand why people like games like COD, even the online play is just tedious because it is the exact same maps, you go to camp the same area each map, or rush the same area in each map. It is just so damn boring!