For me, it was Torchlight, i remember playing for 6 hours once during December a few years ago, my brother gifted it to me on Steam and i sorta got hooked to Steam as a result.
But currently, im leaning towards World of Warcraft, but only for the sake of grinding old content in preparation for Mists, still need to gather some people for Mojo sometime and getting around to getting the Crawling Claw and Crimson Whelping somehow....
As for Minecraft, its one of those games that gets boring when playing alone, simply having access to blocks and a safe mode just makes building things too easy, whereas playing on a multiplayer server has more danger but a more larger creative pool of people, its interesting to see what things people build....but i just lose interest in it since my Brother usually resets the server every update or so, meaning it's just pointless making diverse housing locations if the next spawn location lacks some items.
