Most of mine are on PC as I started out on PC before moving to console.
A couple stand out for me.
Operation Flashpoint: cold war crisis
Amazing, it felt very organic, and the enemy ai were pretty decent as well from what I remember.
Interstate 76
I look back at this and has it aged, but at the time it was brilliant, the open world felt huge and the story was pretty good as well. Proper mad max style game.
Delta Force
Another classic of mine I played over and over again.
I guess on console as mentioned GTA (original), that was something so original and broke so many boundaries with what you could do.
As already said as well, not many games now offer these moments of greatness and originality, and its nothing to do with getting older, devs and studios are just lazy, all it's about now is making as much money as possible by milking the gaming community with in game purchases/cosmetics, and releasing a rehashed version of the game the following year, and a lot of gamers gobble it up.
That said there is devs out there that still make some great games.