This is probably pretty generic, but I still felt like making this thread so I did. Personally, my favorite video game is a tie between Half-Life and Half-Life 2. Both of them had signifigant impact on the video game industry as a whole and I think they are deserving of their reputation. Runner ups include Team Fortress 2, the gearbox HL expansions, HL2 episodes, TES Morrowind and TES Daggerfall.