Currently my obsession is Terraria. I never gave it a chance until a few weeks ago, and ended up playing it more and more. Now, i'm at the point where I play it most of the day, and I am sure I still haven't gotten very far into it yet.
I consider myself the number one fan of The Elder Scrolls Series. I've them all going forward from Daggerfall, and loved every single one (though Skyrim is a great game, it does feel less like a proper Elder Scrolls game. It still is a gem though). When I get a PS4 and a copy of Elder Scrolls Online, i'm pretty sure everything else is going to pretty much neglected as far as leisure time goes.