1. Unreal
2. Deus Ex
3. Half Life 1 Opposing Forces
4. The Wheel of Time
5. Unreal Tournament (does playing vs. godlikes count as single-player? :)
6. Riddick: Escape From Butcher Bay
7. Star Wars: Jedi Outcast
8. Golden Eye
9. Alien vs Predators (marine campaign is freaking awesome)
10. The Darkness