I have had this sort of experience but with other type of games.
The game that I have enjoyed the most and has probably consume me more than 200 hours playing is Skyrim.
This game is the most epic and complete adventure I have ever had. The music is austanding, the world is incredibly alive and with random things happening all the time. The expansion were great. I have never experienced something like Skyrim before. I bought this in 2011 and still remember the good times I had with it :)
This game was so enjoyed by me, that even 2 years later with gta v I still used to go back and have a good time with Skyrim.
I have been waiting for the elder scroll 6 for some time. I hope its releases this year Bethesda!!!
I enjoyed skyrim, like all other bethesda open world games, but for me having other players has always sweetened things up. The elder scrolls mmo I havent played actually, so maybe ill eventually give that a try.