Title speaks for itself, what's your top 5? Mine is the following:
1. Super Smash Bros Melee
The ultimate game. Fun to just play, a great party game and a great game to invest time into. It doesn't matter how seriously you play this game, it's fun either way.
2. Batman Arkham City
My favorite Arkham game tops. Great story, great gameplay and good replay value.
3. Legend of Zelda Link to the Past
Simple gameplay at it's absolute best. An absolute joy to play and replay.
4 Pokemon Emerald
I've been a Pokemon fan all my life but this my favorite, can't really specify why.
5 Fifa
Okay, I know, blasphemy but I play way too much Fifa for me to leave it out of a list like this.