Skyrim wasn't revolutionary though. Its open-world format was already popular with Morrowind and Oblivion in the 2000s. In contrast, Dark Souls and BOTW were both revolutionary. Dark Souls established the Soulslike genre and asymmetric multiplayer, while BOTW established the chemistry engine and intuitive world physics.Without Skyrim and arguably Dark Souls, you don't have BotW.
I'd lean towards the former being the definitive game of the decade. We've had so many open world games this gen trying to capture the magic of Skyrim and not many have succeeded.
For the 2000s, I'd argue that Call of Duty 4 is the defining game. It singlehandedly transformed the control scheme for FPS games on controller and every FPS game afterwards tried to emulate what it did in multiplayer. To this day, CoD sells tons and tops charts constantly.
For the 2000s, I'd have to agree with OP. COD's dual-stick controls were already popular with FPS games like Halo before it. In contrast, RE4 established the over-the-shoulder camera system in third-person action games. Ever since RE4, almost every third-person action game has adopted its over-the-shoulder camera system. The impact of RE4 on third-person action games is bigger than the impact of COD on FPS games.
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