All of the current generation systems have great games that should be experienced by all gamers. While this list is always evolving, these are my current twenty favorites

1. Gears of War (1&2)

2. Killzone 2

3. Fallout 3

4. Call of Duty 4

5. Dead Space

6. Bioshock

7. Resident Evil 4 (Wii Version), Resident Evil 5

8. Valkyria Chronicles

9. Little Big Planet

10. Halo 3

11. Dead Rising

12. Metal Gear Solid 4

13. Mass Effect

14. Uncharted: Drakes Fortune

15. Batman: Arkham Asylum

16. Rock Band (1 & 2)

17. Street Fighter 4

18. Elder Scrolls IV: Oblivion

19. Metroid Prime Trilogy

20. Left 4 Dead

Please let me know if there are any great games that I have missed because I am always looking to improve my collection.