Top 5 Video Games.

This is a list of Top 5 Video Games categorized by genre. Here we go! This'll be long and in no particular order.

First Person Shooter.

• Half-Life 2 and episodes.
• Unreal Tournament 2004
• Bioshock
• Metroid Prime (series)
  
• Team Fortress 2

WRPG.

• The Elder Scrolls III: Morrowind
• Baldur's Gate II
• Diablo I & II
• Planescape: Torment
• Nox
  

JRPG.

• Final Fantasy VI
• Earthbound
  
• Final Fantasy IX
• Mother 3
  
• Chrono Trigger

RTS.

• Starcraft
• Warcraft III
• Dawn of War: Dark Crusade
• Age of Empires 2
• Sins of a Solar Empire
  

Fighting.

• Street Fighter 3: 3rd Strike
• Capcom vs Snk 2
• Marvel vs Capcom 2
• Mortal Kombat Trilogy
• Guilty Gear X2

Adventure.

• Grim Fandango
• The Secret of Monkey Island
• Day of the Tentacle
• Escape from Monkey Island
• (space)

MMORPG.

• World of Warcraft
• Everquest
• Star Wars Galaxies Pre-CU
• Asheron's Call
• Ragnarok Online

Racing.

• F-Zero GX
• Wipeout
• Mario Kart (series)
• Lego Racers
• Burnout: Revenge

Simulation.

• Sim City (series)
• The Sims (1 and expansions)
• Rollercoaster Tycoon 2
• Dungeon Keeper (series)
• Ghost Master

Indie Games (Or games made by a three or less people.)

• Cave Story
• Knytt and Knytt Stories
• Dwarf Fortress
• Spelunky
• Touhou (Series)

Mix & Match.

• Shadow of the Colossus
• We <3>
• Yume Nikki
• Legend of Zelda: Majora's Mask
• Portal
  

Honorable Mentions.

• Civilization IV and Expansions
• Gran Theft Auto (series)
• Silent Hill (series)
• Resident Evil 4
• Devil May Cry 3
• Street Fighter 2 and iterations
• Ikaruga
• Deus Ex
• Quake 3 Arena
• Fallout 3
  
• Beatmania IIDX
• Suikoden II
• Valkyrie Profile
• Painkiller
• NetHack
• Uplink
• Super Metroid
• Metroid Fusion
• Metroid Zero Mission
  
• Castlevania: Symphony of the Night
• Mario Broters (series)
  
• Supun Smosh Broters (series)
  
• Legend of Zelda: OoT, OoS, LA, ALTTP
  

My opinion matters.