Assuming that Main Quest Lines, Campaigns and Story Lines can be considered the same thing.. 1.) TES:IV Oblivion 2.) Mass Effect 2 3.) TES:V Skyrim 4.) Mass Effect 3 5.) Halo 3: ODST Honorable Mentions: Assassins Creed 2 Assassins Creed Brotherhood Halo 2 Halo 3