Right now all I play is Oblivion. It's the only game I've got for my PS3, actually, because I'm afraid to part with alot of money to possibly wind up with a game I don't like. Was toying with the idea of getting Dragon Age, but since Sims 3 is about to finally make it to console, I'll be going there...
So I'll be leaving the world of Cyrodiil soon when Sims 3 comes out, but I certainly will come back to Oblivion, no doubt.
I'll probably only give it up for good if TES: V is even better.
Two games I've played ever since their very first release are Championship Manager (now Football Manager) and Heroes of Might and Magic. Those will always be on the top of my list of games I go back to every so often. I've been struggling to find a proper computer RPG as I've never tried one that have come close to the feel of the real feel of RPG, but now I think I might have found it. It definitely feels like this is another one I'll be playing for a long time to come and I'll certainly be sure to keep an eye on the 5th installment. I'm actually kinda glad I didn't discover it until now as it's all patched up and have tons of great mods.
I did Heroes of Might and Magic on the PS2 years ago. Not a bad game when compared to some of the other crappy "RPGs" that were out at the time for this console.