Maybe it's because I grew up without access to video games, but I think there are some seriously fantastic games out there. A lot of them are pretty old as well, which makes it very cost affective to enjoy a good game. I have been playing a comfy mix of Quake and Hotline Miami at the moment, and I have to say, I feel like I could play these games over and over.
Interestingly enough, another game that I have taken to playing is Overwatch. It's a pretty bare game in terms of content, and before trying it at a friend's house I had not interest in it whatsoever, but it really shines in playability. Nothing is more fun for me than digging around the internet for strats and ways to handle different situations, and than implementing them in the game as I go. A lot of games will have me play for a bit and than switch to something else when I become bored, but I could (and have) play overwatch for hours and hours.