I honestly don't know. While there is a long list of PC games I like I can't decide which one is the absolute best.
Some of my favorites:
-StarCraft 2
-Left 4 Dead 2
-Dota 2
-Call of Duty 4
-Rome: Total War
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Cossacks, theme hospital, Theme Park world Jurassic Park operation genesis Spore loved to play these games.
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Age of empires 2.
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RPG - The Elder Scrolls V: Skyrim FPS - Team Fortress 2 MMO - Terra RTS - Starcraft 2
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Rise of Nations Witcher Starcraft Rollercoaster Tycoon
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Planescape: Torment
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RPG - Morrowind FPS - Deus Ex Racing - Trackmania: Sunrise Strategy - Age of Mythology Indie - Minecraft Lots of memories with these games with some of the best communities around.
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Probably Minecraft. Some of the best fun I've had in gaming has been on Minecraft.
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Star Wars Episode 1: the game no question.
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TES II and III
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Any of the STALKER games.
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Theme Hospital.
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Wolfenstein: Enemy Territory.
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Operation.
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Half-Life. Myst/Riven are a close second/third.
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AVP 2
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Fallout and TES series in general are amazing
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F.E.A.R. and then CoD 2, only PC version, them mods man
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Age of Empires II: Age of Kings and Dungeon Keeper 2.