In No Particular Order... 1. The Half-Life series 2. (Minus Ocarina of Time which I LOVED) Every other game in the Zelda series 3. Fallout 4. World of Warcraft 5. Everquest

I'm going to just tag series if there is more than one title bearing the name (unless a sequel was especially heinous so as to deserve exclusion) but WILL include the system as some titles are still going 20+ years strong: (In No Order) 1. Super Mario Brothers- NES: Hail to the King, Baby! 2. Dragon Warrior- NES: The Root of the Modern RPG 3. Knights of the Old Repubic- PC: Redefined what an RPG experience could be 4. Baldur's Gate- PC: Rehauled and totally redefined the RPG genre 5. Halo- X Box: The product of the FPS evolved to its highest form