Top 5 games of ALL time for various reasons:
Pac-Man (Classic)
The Legend of Zelda (The first action RPG I can ever remember)
Super Mario Bros. (When I played to level 1-4 and the princess was in another castle, I was dumbfounded and couldn't believe there was more)
Tetris (Still being played after over 30 years)
Red Dead Redemption (For some reason, this game still holds a weird grip over my soul)
I hate having to stop with 5, but just on the outside.
Street Fighter 2 (The fighting game that defines the genre to this day)
GoldenEye 007 (The shooter that all other shooters wish to be)