There was some game where a girl went to an abandoned house and it turns out her sister was a lesbian. It was like reading a young adult novel.
Kastle Krashers was OK for 10 minutes but the gameplay didn't have much depth.
Papers Please was an interesting gimmick where the gameplay got old fast.
Ilomilo (actually, on the XBox store) is a fun puzzle game, but something I just pick up every once in a while.
And probably a few others I can't think of right now.
Just in general, what I've seen hasn't convinced me there's a whole new world of great games I'm missing out on. Also, it seems like a lot of them can be played on even a really old non-gaming PC.
No interest in mods, really.