I guess people keep voting for their personal favourites - I mean, Minecraft not getting to runoff (let alone winning by a slide) is to me facepalm worthy, though not at all unexpected on VGC.
Anyway, two of my favourites are in the poll (Portal 2 and Dark Souls) - I haven't voted for either of them in the first round, but I will eliminate Portal 2 at this moment - personally, I find it to be a better and more polished game per se, but this now boils down to influence on future games as well, and Dark Souls easily has upper hand in that.
Only other contender would be Skyrim - for me that was a solid game, but really dumbed down TES, so nowhere near my favourites, but its influence was quite noticeable. There were other open world WRPGs (and much better at that) from decades ago, but this one resonated with a mainstream audience quite a bit and, as a consequence, influenced massively what developers and publishers are trying to achieve in the 2010s (rippling even to usually hermetic Nintendo development).
Ultimately, I think I will go with Dark Souls - while Skyrim is a massive influence on the shift toward open world games, open world games were happening for decades, in one form or the other (mostly on computers, but some on consoles as well). Souls, on the other hand, became a genre of its own (though as sort of 3D Metroidvania, that was not all completely new either). Demon's might be the first to establish the formula, but it was Dark first to be noticed across all platforms and (re-)establish "git gud" era.







