Over the last 30+ years I have played many games on various systems from the Mini Munchman that started it all to the current consoles. This is my list of the best games of all time in alphabetical order.

Assassins Creed Ezio Trilogy (Xbox 360)
Batman Arkham Asylum (Xbox 360)
Borderlands (Xbox 360)
Brothers A Tale of Two Sons (PS3)
Carcassonne (iOS)
Castlevania - Symphony of the Night  (PS1 & XBLA)
Deus Ex Human Revolution (360)
Elemental Gearbolt (PS1)
Front Mission 2 (PS1)
Final Fantasy 3 (6) & 7 (SNES, PS1)
Fallout 3 (XBOX 360)
Game Dev Story (iOS)
Gran Turismo (PS1, PS2)
Halo Series (PC, Xbox, Xbox 360)
Journey (PS3/PS4)
Lego City Undercover (WiiU)
Lost Cities (iOS)
Mario Bros (NES)
Mario Kart (Various)
Mass Effect Trilogy (360)
Metal Gear Solid (PS1)
Mech Commander 2 (PC)
Mini Munchman (Handheld)
Monument Valley (iOS)
Red Dead Redemption (360)
Street Fighter 2 (Arcade/SNES)
Space Harrier (Arcade/Sega Master System)
Sonic the Hedgehog (Sega Megadrive)
Super Mario World (SNES)
Shining Force (Sega Megadrive)
Suikoden (PS1)
Shadow Complex (XBLA)
Sword & Poker (iOS)
The Last of Us (PS3)
The Witcher 3 (PS4)
Tomb Raider (PS1)
Tetris (Gameboy)
Uncharted Series (PS3/PS4)
Walking Dead - TellTale (360/PS3)
X-Com Enemy Unknown (360/PS3)
Xenogears (PS1)
Zone of the Enders (PS2)