Terraria should definitely be on this list. It may not have a following like Skyrim or Fallout but once you play it you will keep going back. As of this writing I have around 900 hours total in that game.
Age of Empires 2, Diablo 2, and Fallout NV deserve this list. Borderlands should be on this list, and I'm actually hurt that KOTOR isnt here. Overwatch does not deserve this list, nor Skyrim. And no fighting games? Seriously?
Games like Metro and Doom have great replayability. However, I don't think games like Borderlands, Fallout or even Mass Effect have good replay value.. because a majority of the time you're just an errand boy and that gets boring real quick. Most times if I have to replay one of those types of games I usually leave out all those boring side quests I did during the first playthrough.
I do fondly remember Diablo II but I think Path of Exile is better. Also Factorio is great, especially with nuclear power. Currently doing a no-logistics achievement run with a friend. I don't think I could ever bring myself to do the build-almost-nothing-in-hand run though. Would be a massive PITA to get to the point where the robots do the heavy lifting.
i find it odd that some of you dont think skyrim deserves to be on this kind of this. it is very near a 6 year old game and according to steam lists and other console related poles it is still one of the most played games. compared only to other single player games it is even more impressive. if you took all the mods ever from every other game in history and compared them to skryim mods, they probably still couldn't compare to skyrims mods.
to be fair gta5 should be on the list as, like skyrim, it is one of the greatest video games of all time. many of the others are definitely questionable, but it is a very subjective topic.
S.T.A.L.K.E.R. series is about 200% more re-playable than the Metro series. Also, for a list made by grown-ups, I cannot fathom how Steel Panthers and Panzer General are not on the list. In my opinion Warhammer 40K: Dark Crusade and Sims 3 deserve a nod as well.