Dota for it's rotten community that made trying to find something that wasn't dota in warcraft 3 miserable.
Fallout 3, the game was made to appeal the console crowd, cannon and lore is not consistent woith the old games, gameplay felt clunky, boring green and color pallet, the main quest was lame, the finally boss was a joke, also your actions were rendered meaningless with a very brief ending.
Minecraft, grossly overrated. Too many people over praising it and people like the Yogscast, UberHaxorNova make videos about it can cash off it. Gameplay gets dull rathering quickly for a sandbox after a few hours of play. Also the creator fails to credit Infiniminer. The game itself has some interesting stuff like physics, water physics, and atmosphere.
TF2, it was better before hats and weird weapons. The game was simple and it was about two companies that wanted to destroy each others assets. Now the game has devolved into hat collecting and weird items that made the game loose it's shine. It was fun for it's early days, but now Valve is beating the dead horse.