For RPG, definitely get Skyrim and Fallout 3 - the base games are good, and the modding community is huge so you can tailor your game to whatever you want it to be.
I also recommend any strategy game made by Paradox Interactive, such as Crusader Kings 2 and Europa Universalis 4 - they both have near endless replay-ability and are immense fun.
If you want to go retro, there's a great FPS called Unreal Tournament - the first game was made in '99 and is huge fun - I think there is still an online playerbase somewhere
I also recommend any strategy game made by Paradox Interactive, such as Crusader Kings 2 and Europa Universalis 4 - they both have near endless replay-ability and are immense fun.
If you want to go retro, there's a great FPS called Unreal Tournament - the first game was made in '99 and is huge fun - I think there is still an online playerbase somewhere
If more of us valued food and cheer and song above hoarded gold, it would be a merrier world. - J.R.R Tolkien