Marduk wroteI forgot to mention, I really hate football games(and anything related to them), I feel that its a bit stupid to watch and play it , while you can actually live it.
yuck football games are the worst, seriously who plays those?
I have to agree about the witcher and skyrim those are your best bets for endless single player games. GTA V probably fits in that category as well.
can I suggest something else? something that isn't endless,but is really fun and different?
try AAA puzzle games. I'm talking about Portal and the Talos principle (still playing it no spoilers) they are both cheap now and oh man they will mess with your head. One moment your playing a game, the other you are doubting everything in the real world. They may not be endless, but they are a refreshing change, and very cheap too, they are a no brainer. So few people play them in this part of the world, they have no idea what they are missing. Buy them, and if you don't like them, blame me!!
A word of warning though, finishing another game will never feel as satisfying again. Also the talos principle will really really mess with your head, don't play it if you don't like that, if you don't know whether you like that or not, go for it