The games I keep going back to lately are Supreme Commander: Forged Alliance and DOTA 2. GalCiv 2 is another one that tends to have a permanent home for me, although we'll see once GalCiv 3 comes out...
"How do I get rid of a Trojan Horse?" -Sailor_Kakashi "Leave it outside the gates of Troy overnight." -Davel23
Mungyo dance 3 Dwarf Fortress World of Tanks Worms Reloaded (I wish World Party had easy working multiplayer that I could join my steam friends on, otherwise I'd have that instead)
Digital Storm posted...
I always keep going back to EVE Online.
I really wish I could, but after spending nearly 380$ on it and playing for a few years I realized that since I didn't do PVP at all and had essentially maxed out my PVE needs I was paying for a IRC chat room where I station traded and ran missions against really dumb AI with a very overpowered ship.
I remember getting bored enough where I started doing level four missions in assault frigates in lowsec space just because I could (and that's where the quality 20 agents where) but that stopped being a thing when agent quality was removed.
I think I'm the only person on gamefaqs with a daughterboard - ToastyOne New with a moderation history more plentiful than karma. - Fossil (Moderator)
Can't think of any specific games that I'd literally never uninstall but it's a fairly sure bet that you'll always find some version of Battlefield, a copy of WoW and Quake 3 arena on my system on a given day