1. Super Smash Bros Melee ( played it for like 2 years every day with friends from school)
2. Metal Gear Solid (whole series with the first part being the best)
3. GTA San Andreas and Vice City
4. The Witcher 2
5. Fallout series
6. Zelda A link to the past (best zelda game)
7. Gothic 1&2
8. The Elder Scrolls series
9. Super Mario World and Mario 64 (SMW was the first game I played and SM64 was the first game I completed 100%)
10. Pokemon Silver&Gold (so much better than the first and lost interest after Gen 3 or so)
11. Tony Hawk series for ps1 and ps2
I'm old school