109.com has prepared a list of the 10 worst sci-fi video games that people play, and they do look pretty terrible. There are videos of the games at the source if you want to see them in action.
Here is the list:

10) Nortal Combat
9) First-Person Shooter
8) Bodysurfing For Algernon
7) Whatever the hell game Sheppard is playing
6) Wizards And Warlocks
5) The Scooby Game
4) Sumo Slammers
3) Global Domination game
2) Bishop Of Battle
1) Suckdisk